Briggs and Stratton 206 Starters Guide

Briggs and Stratton 206 Starters Guide

2016 206 Engine Class Regulations The 206 engine platform was designed and engineered exclusively for racing. Each engine is hand-built in Milwaukee, Wisconsin using dedicated tooling and dies to provide a level of consistency unmatched in the industry today. The 206 is intended to simplify racing, from hitting the track to the tech process needed to ensure a level playing field at the end of the day. In combination with Briggs & Stratton Racing s slide restriction system a complete racing ladder can be developed by simply changing a carburetor slide and/or by a slide and ignition change. With the base engine the basis for today s box stock classifications, the 206 engine gives racer s and tracks the ability to have one engine, from start to finish. All Briggs & Stratton (B&S) racing engines are manufactured solely for sanctioned racing only. B&S does not recommend the products referenced herein to be used for an application outside of sanctioned racing as serious injury or death could result. This rule package has been prepared by Briggs & Stratton Racing and is intended to establish the basis for the technical control of the classes in which the 206 and 206 contact your sanctioning body.

This rule package covers all engine related technical specifications. For all other regulations beyond the engine please refer or contact your sanctioning body. CONTENTS 1. Briggs & Stratton Racing Class Structure... 2-3 2. These Regulations Are the Only Regulations... 4 3. Briggs & Stratton 206 Product Availability... 4 4. General Rules... 4-5 5. Things That Are NOT Permitted... 5 6. Engine Sealing... 6 7. Technical Inspection Tools... 6 8. Engine Ignition Switch... 6 9. Engine Air Filter... 6 10. Engine Fuel... 6 11. Engine Oil... 7 12. Oil Breather... 7 13. Oil Catch Container... 7 14. Carburetor Overflow... 7 15. Fuel Pump... 7 16. Cooling Shrouds, Covers and Blower Housings... 8 17. Use of Helicoils... 8 18. Carburetor & Intake Manifold... 8-9 19. Cylinder Head... 10 20. Head Gasket... 10 21. Ports... 10-11 22. Valves... 11 23. Valve Springs... 11 24. Rocker Arms, Rocker Ball and Rocker Arm Studs... 11-12 25. Push Rods... 12 26. Engine Block... 12 27. Valve Lift... 13 28. Camshaft Profile Limits... 13 29. Flywheel... 13 30. Ignition System and Ignition Timing... 14 31. Crankcase... 14 32. Clutch... 14 33. Starter... 14 34. Exhaust Header.... 14-15 35. Exhaust Silencer... 15 36. Exhaust Protection... 15 37. Torque Specification Guideline... 15 38. Technical Inspection Tools... 15 39. IMPORTANT ONLINE SUPPORT RESOURCES... 15-16 2

1. Briggs & Stratton Racing Class Structure The following class structure chart is intended as a reference only. Sanctioning bodies and organizations can alter the class structures to suit their driver licensing protocols. Briggs & Stratton Racing Class Structure Class Age Weight Technical Engine Package (Pounds) Configuration Kids Kart.350 Restrictor Per sanctioning body/club regulations Junior 206 with carb lock RLV pipe (#5507) Slide (#555728) 4,100 RPM Rev Limiter Novice.450 Restrictor Per sanctioning body/club regulations 206 with carb lock RLV pipe (#5506 or 5507) Purple slide (#555735) Cadet -.440 Per sanctioning body/club regulations 206 with carb lock RLV pipe (#5506 or 5507) Red Slide (#555733) Junior 1 CLUB-.490 Per sanctioning body/club regulations 206 with carb lock RLV pipe (#5506 or 5507) GREEN Slide (#555740) Junior 2 LEGACY.520 Per sanctioning body/club regulations 206 with carb lock RLV pipe (#5506 or 5507) Blue Slide (555734) ASN Nat. Junior -.570 Per sanctioning body/club regulations 206 with carb lock RLV pipe (#5506 or 5507) Yellow Slide (#555741) Briggs & Stratton 206 Senior Per sanctioning body/club regulations 206 RLV pipe (#5506 or 5507) Stock Slide (#555590) Masters Per sanctioning body/club regulations 206 RLV pipe (#5506 or 5507) Stock Slide (#555590) Cadet, Novice, Junior 1, Junior 2 and National Junior classifications require the installation of the locking cap Part #555726 on the carburetor slide cover. It is not permitted to run the classes without the specified slide and locking cap. The locking cap must be tightened. A seal can be utilized at the discretion of the organizer, or alternatively painted by the technical officials.. 3

Optimization of the slide opening in Briggs & Stratton Cadet, Novice, Junior 1, Junior 2 and National Junior classes is permitted. The only allowable method of slide optimization is by removing material from the throttle cap area highlighted in RED. The use of multiple gaskets and/or machining of the slide is prohibited. Slide opening must not exceed the appropriate no go specification as per class regulations. For information on slide optimization see video section at www.briggsracing.com CAUTION The risk of pushing the limit on the slide opening is an unnecessary DQ. For every.010 of slide opening, due to the efficiency limitations of this engine, is less than.1 hp. Give yourself a buffer because it makes no measurable performance differences. 2. These Regulations Are the Only Regulations a. Only the B&S Racing Department in Milwaukee can make changes to the technical specifications herein. b. B&S dealers and their agents are not authorized to alter, verbally or otherwise, any technical specifications or competition rule herein. c. Should any B&S literature, catalogues, manuals, videos, etc. be different than these regulations, these regulations take precedence. d. Changes, corrections, addendums, etc. will be submitted to sanctioning bodies and posted at www.karting.com for republication and will become effective on a date specified. 3. Briggs & Stratton 206 Product Availability The 206 engine products and service parts are available only through the authorized Briggs & Stratton Racing dealers. A list of authorized dealers can be found at www.karting.com 4. General Rules a. The terms stock, original equipment, OEM, unaltered, etc., refer to Original Equipment supplied by Briggs & Stratton. b. Only the original equipment Briggs & Stratton 206 #124332-8201 or Junior 206 #124332-8202 engines are allowed in the classes recommended herein. c. All parts must be unaltered Briggs & Stratton 206 parts specifically made for this engine by Briggs & Stratton. No aftermarket parts to be used unless specified in these regulations. d. All parts are subject to comparison with a known stock part. This includes specified and mandated aftermarket parts. Example: RLV exhaust and Silencer. e. For ALL other regulations, general safety, etc., contact your sanctioning body. Example: Chain guards. 4

f. The tech official, at their sole discretion, may at any time replace a competitor s sealed engine, carburetor, or head assembly with another sealed engine or known stock part. Failure to comply is grounds for disqualification. g. Briggs & Stratton 206 classes must have a serialized block. Exception: For early built engines without a block serial number the engine identification sticker must be in place and legible. If the sticker is illegible or missing the engine must be tagged with a suitable sticker or seal approved by the technical inspector. h. Standard organizational protest procedures can allow for short block inspection (seal removal) if a new, replacement short block, p/n 555715 is offered in replacement. Competitor short block to be forfeited to the series or club as terms of this procedure. 5. Things That Are NOT Permitted a. Tampering of the factory installed engine seals (2). b. Addition or subtraction of material in any form or matter. a. Exception Valve maintenance (valve job). Valve seats must remain with the factory specification of 30 and 45 degree angles only. Valve seats of additional angles and/or angles not comparable to the factory stock of 30 and 45 degrees are not permitted. Grinding of valve stem or excessive material removal prohibited. b. Exception Optimization of the slide opening in Briggs & Stratton Cadet, Novice, Junior 1, Junior 2 and ASN National Junior classes classes are permitted per section 1 guidelines. c. Blueprinting unless stated herein. d. Modification to or the machining of any parts in order to bring them to stated minimum/maximum specification, (or for any reason). e. Machining or alteration of any kind to the engine or replacement parts unless specifically stated herein. f. Deburring, machining, honing, grinding, polishing, sanding, media blasting, etc. g. Sandblasting or glass-beading any interior engine surfaces. h. No device may be used that will impede, or appear to impede, airflow to the engine cooling system. 5

6. Engine Sealing There are two custom, Homeland Security Tier III rated seals installed at the factory. Tampering of the seals is not permitted. Should the seals be tampered with, the engine is no longer eligible for competition. Should an engine require dismantling for any reason that requires breaking of the seals, contact Briggs & Stratton at: Briggs & Stratton Racing Email: Briggsracing@basco.com Seals can have either a black anodized or bare aluminum finish on both main body ends as shown. PLEASE NOTE THAT, STARTING IN 2015, A PROPRIETARY CABLE CONTAINING A BLACK STRAND WILL BE IMPLIMENTED. 7. Technical Inspection Tools Briggs & Stratton have made available a number of tools for the convenience of technical checking of components when necessary. They are indicated throughout the rule thusly: Tech Tool #. See Section 38 for tool description. The tools are available from: Sox Racing 2223 Platt Springs Rd. West Columbia, SC 29169 (803) 791-7050 8. Engine Ignition Switch The B&S ignition switch and wires must remain in stock location. It is not permitted to alter the OEM wiring. 9. Engine Air Filter The only air filter permitted is the Briggs & Stratton Green Air Filter Part #555729. No modification to the filter element is permitted. A protective shield may be attached for wet-weather competition. It is not permitted for the protective shield to create any ram-air effect. 10. Engine Fuel Premium Gasoline no greater than 94 octane sold at normal roadside fuel stations open to the public. The addition of fuel additives in any manner is not permitted. Fuel dispensing location may be specified in Event Supplementary Regulations. 6

11. Engine Oil High-quality synthetic oil within a 10W-20 range recommended. No oil additives are permitted. Factory Recommendation- Briggs & Stratton 4T Synthetic Racing Oil is engineered exclusively for the rigors of high revving, air-cooled racing engines (available through both Briggs Racing and Amsoil dealers). The use of karting or automotive oils is not recommended as many are hydroscopic in nature, offer limited protection over time, and/or were engineered for pressure, not splash lube systems. The use of these oils can induce engine failure and/or accelerate wear. 12. Oil Breather Oil breather must vent to a catch container. 13. Oil Catch Container An oil overflow catch system is mandatory. Overflow tube must run from the crankcase breather to a catch container. The catch-container must be vented to atmosphere. 14. Carburetor Overflow Carburetor overflow must be vented to a catch container. 15. Fuel Pump Only fuel pump, B&S part number 808656, is legal for competition. This fuel pump can be identified by the Briggs & Stratton diamond logo on the pump face. All other pumps are prohibited. It is prohibited to pulse from the intake manifold. Relocation of the fuel pump is legal as long as it is spaced to less than 3/4 inch off of the control plate, B&S #555699, in a similar location that is both safe and secure. Measurement is from the base of the control plate to the bottom of the fuel pump. Vertical mounting or mounting the fuel pump upside down is NOT allowed. The fuel pump must be pulsed from a pulse fitting mounted on the oil fill fitting located on the engine side cover. Aftermarket one-piece filler/pulse fittings such as shown on the right are permitted. The use of silicone sealant on the brass vent is permitted. A fuel pump return line to the fuel tank is prohibited. A fuel filter is to insure that dirt and contamination within your fuel system does not impact your carburetors performance. This is not a tech item. 16. Cooling Shrouds, Covers and Blower Housings All pieces of the engine cooling shroud/blower housing and control panel must be stock B&S and properly installed. Engine Shroud may be painted any color. Any bolt, with the exception of the head bolt, that is used to secure sheet metal shrouds and covers may be replaced with larger diameter bolts. No taping or covering of the rewind shroud is permitted. 7

17. Use of Helicoils It is permitted to use Helicoil thread inserts for shrouds, valve cover, oil drain, oil fill holes, blower housing, and exhaust pipe attachment studs on the head and lower brackets. 18. Carburetor & Intake Manifold The B&S stock carburetor part #555658 is the only carburetor permitted. Walbro, Briggs diamond logo and/or #590890 etched in the body are additional visual indicators. No alterations allowed unless stated below. All parts will be compared to a stock known B&S part for eligibility. This includes the nozzle, emulsion tube, jets, float, float needle and all other carb parts. It will be allowed however to adjust the float height by means of bending the small tab on the float arm. Slide must remain B&S stock unaltered. Slide cutaway to be measured on flat surface..075 no go Tech Tool A10. B&S stock unaltered aluminum needle is required part number 555602 marked #BGB. Needle to be inspected using Tech Tool A4. Needle, when placed in tool A4, should not protrude through the other side. If needle protrudes through the block it is out of specification. 8

NOTE: Slide openings should be measured only with the Briggs & Stratton slide tool listed on the tool reference chart. Class Max. Slide Height.350 Kid Kart.310 Opening (Long BLACK).450 Novice.342 Opening (PURPLE).440 Cadet.440 Opening (RED) Junior 1Club.490 Opening (GREEN) Junior 2 LEGACY.520 Opening (BLUE) ASN Nat. Junior.570 Opening (YELLOW) Technical Item Description Tech Tool a. Needle Jet C-clip Needle Jet C-clip must be properly installed but may be installed at any of the 5 factory settings on the needle jet. b. Throttle cable cap Throttle cable cap on the top of the carburetor must be used and properly installed in tight position. c. Choke Choke: OEM unaltered, but lever may be fastened open with a spring, rubber band, wire, etc. d. Idle pilot jet Idle pilot jet #32, hole size is.0130 no go. e. Main jet Main jet #95, hole size is.0380 0.036 go, 0.039 no go f. Main nozzle and Emulsion tube Main nozzle OEM stock unaltered hole size =.101 min and.104 max inches. No drilling, reaming, slotting or oblonging of hole. Emulsion tube OEM stock unaltered 4 small holes =.018 min inches to.021 max inches 4 big holes =.026 min inches to.029 max inches. g. Venturi Measurement Venturi Measurement: Vertical:.792 max inches. Horizontal:.615 max inches at widest part Horizontal:.602 max inches at narrowest part. h. Air pick off hole Air pick off hole -.057 go.061 no go i. Throttle bore Throttle bore Must be as cast and bore max diameter =.874 inches. j. Venturi idle fuel hole Venturi idle fuel hole =.038 inches max k. Air filter Air filter: Only GREEN air filter, part # 555729 is allowed. Filter adapters are not allowed, filter must attach directly to carburetor air horn l. Carburetor overflow Carburetor overflow: Must be vented to a catch container. m. O-Ring O-Ring part number B&S part # 555601 is required and must be unaltered. n. Intake Intake manifold max length = 1.740 inches min to 1.760 manifold inches max Intake manifold bore diameter =.885 inches min to.905 inches max A8 A8 A20 o. Choke Bore 1.149 A7 p. Carb Slide Cutaway.075 no go A10 q. Widest part of Combustion Chamber 2.640 A30 A9 A7 A12 A11 9

19. Cylinder Head a. The ONLY head casting for the B&S 206 herein is the RT-1, cast into the head just off the head gasket surface (towards the rear of the engine, PTO side). The overall head minimum thickness is 2.430. b. Cylinder head must be as cast. Factory machining marks left on the head gasket surface are a tech item. c. Hard Carbon may be scraped from head before measuring. d. Depth of shallow area of combustion chamber must be.030 inch minimum. This measurement to be taken with a depth gage on both the combustion side and spark plug side of cylinder head. e. Depth at floor of combustion chamber is.340 inch minimum. f. Inspect retainers for alterations that would increase valve spring pressure -.055 to.075 maximum flange thickness. Both intake and exhaust must have OE stock B&S valve keepers. g. Unaltered B&S part #555552 (exhaust) and #555551 (intake) can be checked for appearance, weight, and dimensions. No machining, polishing, easing, or alterations of any kind allowed. Valve surface must remain as factory, with one single 45 degree face. No other additional angles allowed on any part of the valve. Tech Tool A22. h. Valve Guides: Replacement of valve guides with B&S part #555645 only is allowed. Maximum depth from the head gasket surface to the intake valve guide is 1.255. 20. Head Gasket a. Unaltered B&S part #555723 is the only head gasket allowed. b. Minimum thickness allowed is.049". Measurement must be performed using a micrometer. Readings are taken from inside the cylinder hole of the gasket closest to the combustion chamber (see diagram). Four measurements must be taken with 3 meeting the minimum thickness of.049. 21. Ports a. No de-burring, machining, honing, grinding, polishing, sanding, media blasting, etc. b. The transition from intake bowl to port must have factory defined machining burr at this junction. No addition or subtraction of material in any form or matter. No alterations of any kind may be made to the intake or exhaust ports. c. Intake Port: Maximum diameter measurement =.918 inches max. Tech Tool A6. d. Exhaust Port AS CAST. Exhaust Outlet -.980 Tech Tool A6. e. Valve Seats. Intake and exhaust: Must remain factory specification with one 30 and one 45 degree angle only. Valve seats of additional angles and/or angles not comparable to the factory stock are not permitted. 10

f. Valve maintenance permitted (valve job). Valve seats must remain with the factory specification of 30 and 45 degree angles only. Valve seats of additional angles and/or excessive material removed when compared to the factory stock is prohibited. g. Intake valve seat diameter inside = maximum.972 inches. Tech Tool A2. h. Intake port pocket bowl (area just below valve seat) =.952 no go Tech Tool A2 i. Exhaust valve seat diameter inside = maximum.850 inches. Tech Tool A1. 22. Valves a. Intake valve Minimum Weight of Valve Diameter of valve stem Diameter of valve head Diameter of valve seat Valve length Height from angle of valve face to top of the valve b. Exhaust valve Minimum Weight of Valve Diameter of valve stem Diameter of valve head Diameter of valve seat Valve length Height from angle of valve face to top of the valve 27.8 grams.246 to.247 inches 1.055 to 1.065 inches Tech Tool A17.972 inches ID maximum Minimum 3.3655 inches.057 inches minimum Tech Tool A26 27.2 grams.246 to.247 inches.935 to.945 inches Tech Tool A18.850 inches ID maximum Minimum 3.3655 inches.060 inches minimum Tech Tool A27 23. Valve Springs (updated 2/2/16) a. Valve Springs are single coil stock, unaltered B&S part #26826. Must be identical in appearance to factory part and have 4.00 to 4.75 coils in stack. b. Spring Wire Diameter:.103 to.107 inches c. Valve spring length:.940 max inches Tech Tool A15 d. Inside diameter:.615 to.635 inches 24. Rocker Arms, Rocker Ball and Rocker Arm Studs a. Rocker arms must be unaltered stock B&S part #691230 (US) or #797443 (metric) and will not be altered in any way. b. Rocker studs must be stock, unaltered stock B&S part #694544 (US) or #797441 (metric) and in stock location 11

c. Rocker Ball must B&S stock. Diameter.590 inch min. to.610 inch maximum. Tech Tool A16. d. Rocker arm mounting positions may not be altered in any manner. No helicoiling of mounting holes. No bending of studs. e. Rocker arm stud plate must be bolted to the head with one, OEM stock B&S gasket only - no alterations. Maximum thickness of gasket is.060 inches. f. Rocker arm overall length 2.820 inch minimum. Can be checked with a pair of dial calipers. 25. Push Rods a. Push rods must be unaltered stock B&S part #555531. b. Push rod length 5.638 minimum inches to 5.658 maximum inches. Tech Tool A5. c. Push rod diameter.185 minimum inches to.190 maximum inches. 26. Engine Block a. Engine block must be unaltered as cast B&S factory machined condition. There must be no addition or subtractions of metal or any substance to the inside or outside of the cylinder block. b. Both (2) B&S engine seals must be present with both the fastener and seal in as shipped from the factory location and condition. Any defined tampering with the fasteners or damage to the wire/seal itself (example: delaminated hologram) are grounds for disqualification. Take proper care of your seals to ensure their integrity. It is recommended that you wrap your seals (using a plastic bag, etc.) to prevent exposure to harsh solvents such as carb cleaner, etc... c. Deck gasket surface finish is not a tech item. Piston pop up can be.005 inches maximum. Piston pop-up to be checked with flat bar in center of piston parallel to piston pin and then again checked 90 degrees to piston pin. Tech Tool A25. Angle milling or peak decking is not allowed. d. Carbon build-up can be removed before pop-up is measured as long as material is not removed from the piston. Exception Competitors can deburr the manufacturing part number/marks IF needed as long as: Removal does not extend beyond the defined script area. De-burring does not extend below the original piston surface area. The original part numbers and script are still clearly visible. e. Cylinder bore will not be bored oversize f. Cylinder bore will not be re-sleeved. g. Cylinder bore position is not be moved or angled in any manner. h. Cylinder bore dimension: - Briggs & Stratton stock bore is 2.690. Allowance for wear is permitted up to 2.693 maximum for entire length, top to bottom. i. Maximum stroke is 2.204. Push piston down to take up rod play. Check stroke on BDC to TDC. Tech Tool A21. 12

27. Valve Lift a. Maximum valve lift is checked from the top of the valve spring retainer. Valves must be adjusted to zero clearance. b. Valve Lift: Camshaft check is taken at the valve spring retainers. With the lash set at zero, the movement of the valve spring retainers may not exceed the following: Intake and exhaust:.255 inches maximum. 28. Camshaft Profile Limits (measured at the push rod) Push gently down on dial indicator stem to ensure that there is no lash when push rods are going down. NOTE: Due to the extended life of the engine, a single point on each lobe can be off by a maximum of 2 degrees without issue, the exception being on the.006 check, both intake and exhaust. Intake lift Exhaust lift 0.006 59 TO 51 BTDC 0.006 101 TO 93 BBDC 0.020 16 TO 12 BTDC 0.020 59 TO 55 BBDC 0.050.5 TO 4.5 ATDC 0.050 43 TO 39 BBDC 0.100 17 TO 21 ATDC 0.100 26 TO 22 BBDC 0.150 33.5 TO 37.5 0.150 9 TO 5 BBDC 0.175 43 TO 47 ATDC 0.175 1 TO 5 ABDC 0.200 54 TO 58 ATDC 0.200 11.5 TO 15.5 0.225 68 TO 72 ATDC 0.225 25 TO 29 ABDC MAX LIFT 0.257 MAX LIFT 0.259 MIN LIFT 0.252 MIN LIFT 0.252 Intake lift Exhaust lift 0.225 38 to 34 BBDC 0.225 76 TO 72 BTDC 0.200 24.5 TO 20.5 0.200 62.5 TO 58.5 0.175 14 TO 10 BBDC 0.175 52 TO 48 BTDC 0.150 4.5 TO.5 BBDC 0.150 42 TO 38 BTDC 0.100 12 TO 16 ABDC 0.100 25.5 TO 21.5 0.050 29 TO 33 ABDC 0.050 8.5 TO 4.5 BTDC 0.020 45.5 TO 49.5 0.020 8 TO 12 ATDC 0.006 83 TO 91 ABDC 0.006 47 TO 55 ATDC 29. Flywheel a. No modifications are allowed to the flywheel. b. The minimum weight of the flywheel, fins and attachment bolts is 4 pounds 1 ounce. c. Stock B&S part #555683 only. No machining, glass beading, sand blasting, painting or coating of flywheel is allowed. d. A flywheel fan, B&S part #692592, with broken fins must be replaced. e. Stock, unaltered B&S flywheel key with the B&S logo is required. Width of the key allowed is.1825 -.1875. No offset keyways allowed. 13

30. Ignition System a. Unaltered B&S stock ignition part #555718 is mandatory. Only GREEN ignition module allowed. Maximum RPM: 6,150. Exception Cadet Junior 206 class requires the use of unaltered B&S stock ignition part #555725 (BLACK in color). Maximum RPM: 4,150. b. Coil or its position, other than air gap may not be altered in any way. Coil mounting bolts must be stock and cannot be altered in any way to advance or retard timing. Attachment bolts and/or bolt holes may not be altered. c. Spark plug: Only the B&S unaltered factory spark plug part number #555737 -Champion RC12YC is permitted. Spark plug must have the Champion and Briggs & Stratton logo as well as the RC12YC identification on the insulator. Sealing washer must be in place as from factory. d. Magneto air gap is non-tech (recommended clearance of.016 ) e. Ignition timing: Maximum of 30 degrees BTDC f. Spark plug connector: Only the OEM B&S part #555714 is permitted. 31. Crankcase Novice class must run the supplied Max-Torque clutch, Part #555727. No alteration to the clutch is allowed, except springs and clutch key are non-tech. 32. Clutch a. Novice class must run the supplied Max-Torque clutch, Part #555727. No alteration to the clutch is allowed, except springs and clutch key are non-tech. b. Junior 1, Junior 2, Senior, and Masters Classes can run any rim centrifugal clutch with a maximum of 9 springs and 6 shoes. No alteration to clutch allowed, except springs. Clutch coolers are not allowed. c. Refer to your sanctioning body general rules for mandatory chain guard guidelines. 33. Starter Recoil starter, B&S part # 695287, must be retained, as produced and intact. Starter maybe rotated. 34. Exhaust Header a. Header must be RLV Model 5507 or 5506 for all classes. b. Header length: a. 5507 will measure 18.75 +/-.25 along the short side using a 0.250 wide tape measure. b. 5506 will measure 17.50 +/-.25 along the short side using a 0.250 wide tape measure. c. Gasket and/or silicone are allowed to seal header to head. (One gasket maximum) d. Studs or bolts are permitted to fasten header to head. Bolts or nuts must be safety wired. 14

e. Helicoiling of the exhaust is allowed. f. Supplied header support brace is mandatory. The addition of a mechanical support bracket (no welding involved) is allowed provided that there are no alterations to the shape or dimensions of the exhaust configuration. g. Any modification for or use of an O2, EGT, CO2 sensor is prohibited. 35. Exhaust Silencer Silencer must be RLV B91XL (part number 4104) with round baffle holes only. Safety wiring of the silencer to header is mandatory. All three baffles must remain unaltered and hole size can be verified using a no-go pin gage of.1285. 36. Exhaust Protection The header must be completely wrapped (360 degrees) with a non-asbestos, approved insulation material or sleeve starting approx. 3 inches from the exhaust flange but MUST extend to where the stock supplied RVL support (welded or clamped) meets the header. 37. Torque Specification Guideline DESCRIPTION WRENCH / SOCKET SIZE TORQUE Air Guard 7mm 40-50 lb-in. (4.5-5.6 Nm) Blower Housing 10mm & 3/8" 60-110 lb-in. (7-12.5 Nm) Carburetor (to manifold) 10mm 80-110 lb-in. (9-12.4 Nm) Cylinder Head Bolts 10mm 200-220 lb-in. (20-27 Nm) Exhaust Brace Screws 10mm 95-125 lb-in. (11-14 Nm) Exhaust Stud 10mm 95-125 lb-in. (11-14 Nm) Flywheel Nut 15/16" 55-75 ft-lbs. (74.5-101 Nm) Flywheel Fan 10mm 180-240 lb-in. (20-27 Nm) Intake (to cylinder) 5mm Allen 70-90 lb-in. (8-10.2 Nm) Oil Drain Plug 3/8" 100-125 lb-in. (11-14 Nm) PVL Module 7mm 20-35 lb-in. (2.3-4 Nm) Rocker Arm Stud 7/16" 90-120 lb-in. (10-14 Nm) Rocker Arm Plate 10mm 70-90 lb-in. (7.9-10.1 Nm) Rocker Arm Set Screw 1/8" Allen 50-70 lb-in. (5.6-7.9 Nm) Spark Plug 5/8" Deep 95-145 lb-in. (11-16.4 Nm) Starter Gear #2 Phillips 35-53 lb-in. (4-6 Nm) Top Control Plate 10mm 70-90 lb-in. (8-10 Nm) Valve Cover 10mm Lower & 3/8" 30-60 lb-in. (3.5-7 Nm) 38. Technical Inspection Tools Refer to separate document illustrating the Technical Inspection Tools 39. IMPORTANT online support resources Please refer to www.briggsracing.com for a host of resources. Due to the sealed nature of this engine we highly recommend reading and viewing important documents and videos to insure a great racing experience. Located online: a. 206 Engine tips and guide supplement A must to print out and read BEFORE installing your engine! 15

b. Carburetor tuning guide Understand your carburetor to get the most out of your 206. c. Videos: a. Proper clutch installation Properly installing your clutch will prevent the possibility of crankshaft damage. b. Setting the float height A simple video highlighting a necessary technique to insure a properly tuned carburetor. c. Setting, measuring, and optimizing your junior slide restrictor. 16

Racing Performance Catalog & Reference Guide Model/Type: 124332 8202-01 (Kids kart/supermileage) Model/Type: 124332 8003-01 (Karting) Model/Type: 124332 8201-01 (Karting/Snowmobiling/Jr. Drag) Version (REV. D) Model/Type: 124332 8203-01 (Quarter Midget)

TABLE OF CONTENTS SAFETY...1 ANIMAL General Specs...3 Special Tools...3 Torque Specs...3 Racing Specifics...3 Optional Performance Parts...3 Highlighted Features...3 Cylinder Assembly Parts Explode...4 Head Assembly Parts Explode...5 Carburetor Assembly Parts Explode...6 Housing & Flywheel Parts Explode...7 Control Bracket & Gasket Sets Parts Explode...8 206 Parts...8 Gear Reduction Unit Explode...9 NO COMPROMISES. At the end of the day the effort you put into racing directly determines your outcome. You wouldn t compromise on your approach to racing, so why would you with your oil? What if there was an oil engineered specifically for high-revving, air-cooled racing engines, methanol or gas fuels, that gives you the power of a lite oil yet the wear protection of a heavy oil? What if that oil also had the added benefits of wear protection and a corrosion inhibitor to safeguard your investment during, between, and after the season was over? COMPROMISES lead TO WhAT-IF S ANd AS RACERS ThAT ISN T PART OF OuR dna. NO MORE COMPROMISES. INTROduCING ThE BRIGGS & STRATTON 4T Full SYNThETIC OIl CuSTOM ENGINEEREd BY AMSOIl. MAXIMuM horsepower OuTSTANdING WEAR PROTECTION EXCluSIVE SYNThETIC FORMulATION EXhAuSTIVElY TESTEd ON ThE dyno ANd ON ThE TRACK designed FOR high REVVING, AIR-COOlEd RACING ENGINES Available through any participating Briggs & Stratton Racing Dealer or your local AMSOIL source of supply. (Part Number GBS 2960) Part Number: GBS2960

BEFORE OPERATING ENGINE Read entire Operating & Maintenance Instructions AND the instructions for the equipment this engine powers.* Failure to follow instructions could result in serious injury or death. WARNING The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. THESE INSTRUCTIONS CONTAIN SAFETY INFORMATION TO Make you aware of hazards associated with engines Inform you of the risk of injury associated with those hazards, and Tell you how to avoid or reduce the risk of injury OPERATOR SAFETY SAFETY AND CONTROL SYMBOLS WARNING Briggs & Stratton Race engines are not designed for and are not to be used to power fun-karts, children s, recreational, or sports all-terrain vehicles (ATVs), motorbikes, scooters, hovercraft, airplane produces, or any other vehicle used outside of sanctioned racing. For information about competitive racing products, see www.briggsracing.com. For use with utility and side-by-side ATVs, please contact Briggs & Stratton Engine Application Center, 1-866-927-3349. Improper engine application may result in serious injury or death. Fire Fast Moving Parts Stop Oil Explosion Toxic Fumes Shock Slow Fuel NOTICE: This engine was shipped from Briggs & Stratton without oil. Before you start the engine, make sure you add oil according to the instructions in this manual. If you start the engine without oil, it will be damaged beyond repair and will not be covered under warranty. Choke On Off Fuel Shutoff Kickback Wear Eye Protection WARNING Fuel and its vapors are extremely flammable and explosive. Fire or explosion can cause severe burns or death. Hazardous Chemical Read Manual Hot Surface Frostbite The safety alert symbol is used to identify safety information about hazards that can result in personal injury. A signal word (DANGER, WARNING, or CAUTION) is used with the alert symbol to indicate the likelihood and the potential severity of injury. In addition, a hazard symbol may be used to represent the type of hazard. DANGER indicates a hazard which, if not avoided, will result in death or serious injury. WARNING indicates a hazard which, if not avoided, could result in death or serious injury. CAUTION indicates a hazard which, if not avoided, could result in minor or moderate injury. NOTICE indicates a situation that could result in damage to the product. WARNING Certain components in this product and its related accessories contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands after handling. When Adding Fuel Turn engine off and let engine cool at least 2 minutes before removing the fuel cap. Fill fuel tank outdoors or in well-ventilated area. Do not overfill fuel tank. To allow for expansion of the fuel, do not fill above the bottom of the fuel tank neck. Keep fuel away from sparks, open flames, pilot lights, heat, and other ignition sources. Check fuel lines, tank, cap, and fittings frequently for cracks or leaks. Replace if necessary. If fuel spills, wait until it evaporates before starting engine. When Starting Engine Ensure that spark plug, muffler, fuel cap and air cleaner (if equipped) are in place and secured. Do not crank engine with spark plug removed. If engine floods, set choke (if equipped) to OPEN/RUN position, move throttle (if equipped) to FAST position and crank until engine starts. When Operating Equipment Do not tip engine or equipment at angle which causes fuel to spill. Do not choke the carburetor to stop engine. Never start or run the engine with the air cleaner assembly (if equipped) or the air filter (if equipped) removed. When Changing Oil When you drain the oil from the top oil fill tube, the fuel tank must be empty or fuel can leak out and result in a fire or explosion. When Transporting Equipment Transport with fuel tank EMPTY or with fuel shut-off valve OFF. When Storing Fuel Or Equipment With Fuel In Tank Store away from furnaces, stoves, water heaters or other appliances that have pilot lights or other ignition sources because they can ignite fuel vapors. * Briggs & Stratton does not necessarily know what equipment this engine will power. For that reason, you should carefully read and understand the operating instructions for the equipment on which your engine is placed. 1

SAFETY WARNING Starting engine creates sparking. Sparking can ignite nearby flammable gases. Explosion and fire could result. If there is natural or LP gas leakage in area, do not start engine. Do not use pressurized starting fluids because vapors are flammable. WARNING Engines give off carbon monoxide, an odorless, colorless, poison gas. Breathing carbon monoxide can cause nausea, fainting or death. Start and run engine outdoors. Do not start or run engine in enclosed area, even if doors or windows are open. WARNING Rapid retraction of starter cord (kickback) will pull hand and arm toward engine faster than you can let go. Broken bones, fractures, bruises or sprains could result. When starting engine, pull the starter cord slowly until resistance is felt and then pull rapidly to avoid kickback. Remove all external equipment/engine loads before starting engine. Direct-coupled equipment components such as, but not limited to, blades, impellers, pulleys, sprockets, etc., must be securely attached. WARNING Running engines produce heat. Engine parts, especially muffler, become extremely hot. Severe thermal burns can occur on contact. Combustible debris, such as leaves, grass, brush, etc. can catch fire. Allow muffler, engine cylinder and fins to cool before touching. Remove accumulated debris from muffler area and cylinder area. It is a violation of California Public Resource Code, Section 4442, to use or operate the engine on any forest-covered, brush-covered, or grass-covered land unless the exhaust system is equipped with a spark arrester, as defined in Section 4442, maintained in effective working order. Other states or federal jurisdictions may have similar laws. Contact the original equipment manufacturer, retailer, or dealer to obtain a spark arrester designed for the exhaust system installed on this engine. WARNING Unintentional sparking can result in fire or electric shock. Unintentional start-up can result in entanglement, traumatic amputation, or laceration. Fire hazard Before performing adjustments or repairs: Disconnect the spark plug wire and keep it away from the spark plug. Disconnect battery at negative terminal (only engines with electric start). Use only correct tools. Do not tamper with governor spring, links or other parts to increase engine speed. Replacement parts must be of the same design and installed in the same position as the original parts. Other parts may not perform as well, may damage the unit, and may result in injury. Do not strike the flywheel with a hammer or hard object because the flywheel may later shatter during operation. When testing for spark: Use approved spark plug tester. Do not check for spark with spark plug removed. WARNING Rotating parts can contact or entangle hands, feet, hair, clothing, or accessories. Traumatic amputation or severe laceration can result. Operate equipment with guards in place. Keep hands and feet away from rotating parts. Tie up long hair and remove jewelry. Do not wear loose-fitting clothing, dangling drawstrings or items that could become caught. Each racer is solely responsible to check and maintain engine legality per the rule set they compete under. Due to the conditions inherent in racing, Briggs & Stratton does not warrant race engines or parts. 2

ANIMAL GENERAL SPECS Model: 124332 Type: 8003-01 Animal 8201-01 Jr. 206 8202-01 LO 206 8203-01 M Series Displacement: 12.48 Cu. in. - 205cc Design: Slant, 30 degree Overhead Valve Bore: 2.6875/2.6885 in. Stroke: 2.2 in. Compression Ratio: 8.5 to 1 Factory Timing: 29 degrees BTDC SPECIAL TOOL REQUIREMENTS General Model 12 Manual Part No. 276781 Flywheel Holder Tool Part No. 19433 PVL Flywheel Puller Part No. 19584 RACING SPECIFICS PVL Ignition Module Gap -.010/.014 (.15/.36mm) Digital Rev Limiter: Max. 12,000 RPM - Part No. 555681 Max. 6,100 RPM - Part No. 555718 Max. 4,100 RPM - Part No. 555725 Oil - Briggs & Stratton Racing recommends using ONLY 14 ounces of Briggs & Stratton 4T full-synthetic racing oil. Briggs & Stratton 4T was specially engineered and tested in conjunction with Briggs & Stratton to protect your investment from the rigors of racing without compromising performance or longevity. Air-cooled, splash lube oil system along with strict manufacturing tolerances and component materials require oil engineered for the task. We do NOT recommend the use of automotive oils as these products were engineered for pressure lubed systems and the lower operating temperatures. We also strongly recommend against the use of karting labeled oils as PAG based oils are extremely hydroscopic by nature (attract water), have a low solubility and TBN, and vaporize within the range of our operating temperatures. Briggs & Stratton 4T Racing oil, p/n GBS2960, is available through your local Briggs Racing or Amsoil dealer. TORQUE SPECS DESCRIPTION WRENCH/SOCKET SIZE TORQUE Air Guard 7mm 40-50 lb-in. (4.5-5.6 Nm) Blower Housing 10mm & 3/8 60-110 lb-in. (7-12.5 Nm) Carburetor (to manifold) 10mm 80-110 lb-in. (9-12.4 Nm) Connecting Rod T27 140-150 lb-in. (16-17 Nm) Cylinder Head Bolts 10mm 200-220 lb-in. (20-27 Nm) Exhaust Brace Screws 10mm 95-125 lb-in. (11-14 Nm) Exhaust Stud 10mm 95-125 lb-in. (11-14 Nm) Flywheel Nut 15/16 55-75 ft-lbs. (74.5-101 Nm) Flywheel Fan 10mm 180-240 lb-in. (20-27 Nm) Intake (to cylinder) 5mm Allen 70-90 lb-in. (8-10.2 Nm) Oil Drain Plug 3/8 100-125 lb-in. (11-14 Nm) PVL Module 7mm 20-35 lb-in. (2.3-4 Nm) Rocker Arm Stud US-7/16, metric-10mm 90-120 lb-in. (10-14 Nm) Rocker Arm Plate 10mm 70-90 lb-in. (7.9-10.1 Nm) Rocker Arm Set Screw US-1/8 Allen, metric-4mm 50-70 lb-in. (5.6-7.9 Nm) Spark Plug 5/8 Deep 95-145 lb-in. (11-16.4 Nm) Side Cover 10mm (patched) 215-230 lb-in. (24-26 Nm) 10mm (unpatched) 160-175 lb-in. (18-19 Nm) Starter Gear #2 Phillips 35-53 lb-in. (4-6 Nm) Top Control Plate 10mm 70-90 lb-in. (8-10 Nm) Valve Cover 10mm Lower & 3/8 30-60 lb-in. (3.5-7 Nm) HIGHLIGHTED FEATURES Dual Ball-Bearing, RACING Reinforced Cylinder Squeeze-Cast, T-7 Heat Treated, Racing Rod Ground Cam w/ Compression Release High-Silicon Valve Springs PVL Digital Ignition System Racing Only Intake Port Walbro Round - Slide Carburetor Interface Sealing Solutions Fire-ring head gasket (Animal/WF only) Racing Crankshaft w/ Induction-Hardened Crankpin Custom Cam Ground, Barrel-Faced Piston Chrome-Faced, Racing Ring Package Nitrited Dished Exhaust Valve Automotive 3-Piece Valve Retainer System Beefy Rocker Arm Stud Nuts Carbon Steel Crankshaft w/induction hardened crankpin OPTIONAL PERFORMANCE PARTS High - G/Force Breather Bypass System - Part No. 555688 Magnetic Drain Plug - Part No. 691663 Gearbox Splined Crankshaft - Part No. 555722 6-1 Gearbox Complete - Part No. 555721 (page 9) Electric Starter Kit - Part No. 555703 Fuel Filter - Part No. 394358S 206 Stator Lighting System (snowmobile) - Part No.555773 ANIMAL ENGINES 3

ANIMAL cylinder assembly (Engine Model Series 124432 ) ANIMAL ENGINES 555660 Piston Assembly (Std.) 555661 Piston Assembly (.10 Over) 555662 Piston Assembly (.20 Over) 555663 Piston Assembly (.30 Over) 555664 Ring Set (Std.) 555665 Ring Set (.10 Over) 555666 Ring Set (.20 Over) 555667 Ring Set (.30 Over) 555688 High-G/Force Bypass Assembly (Optional, Also includes 691890 Rocker Cover Gasket) 555680 Cylinder Shield (Black) 795334 Cylinder Shield (Silver) 699483 Screw (Cylinder Shield - M4 x.7) 555692 Ring Set (.010 Over Compression Ring) 555693 Ring Set (.020 Over Compression Rings) 555694 Ring Set (.030 Over Compression Ring) 555140 Bushing/Seal Kit 692600 Breather Tube 55513 Ring Set (.10 Over - Contains 10 Top Rings) 55514 Ring Set (.20 Over - Contains 10 Top Rings) 55515 Ring Set (.30 Over - Contains 10 Top Rings) 792723 Flywheel Nut (M6 x 1.5-6H) 299819s Oil Seal* (Magneto Side) 798462* Crankcase Gasket * 691664 Hex Head 1" Screw (Connecting Rod - Animal/206) 791784 Hex Head 1 1/4 Screw (Connecting Rod - World Formula) 695087 Timing Gear 798538 Bearing 281658s Oil Fill Cap 692550 Oil Seal (PTO Side) 4 557137 Crankshaft 555626 Connecting Rod 555706 Crankcase Cover 555652 Crankshaft Endplay Shim (Contains.007,.012,.018, &.025) 281658s Oil Fill Cap 555736 Hex Washer Head Metric Screw (Crankcase Cover/Sump - M7 x 1) 691866 Piston Pin Lock 690979 Timing Key (0.370 ) 798972 Timing Key (0.491 ) 696813 Camshaft (Machined) 555584 Camshaft (Unmachined) 691686 Oil Drain Plug* 691663 Oil Drain Plug (Magnetic, Optional) 555705 Cylinder Assembly 690959 Locating Pin* 690824 Ball Bearing 222698s Flywheel Key 557117 World Formula Billet (Optional) 555626 Connecting Rod 499423 Piston Pin *Included with 555705 Cylinder Assembly (Includes all parts shown) Included with Respective Piston Assembly (Includes all parts shown) Included with 557137 Crankshaft 276781 Repair Manual Included with 555706 Crankcase Cover

ANIMAL head assembly (Engine Model Series 124432 ) 692557 Hex Washer Head Screw (Rocker Cover Top & Sides) 694543 US Rocker Arm Adjuster Kit* 797440 Metric Rocker Arm Adjuster Kit** 694544 US Rocker Arm Stud* 797441 Metric Rocker Arm Stud** 699230 Hex Washer Head Metric Screw (Cylinder Head Plate - M6 x 1) 691343 Push Rod Guide* 698214 US Cylinder Head Plate* (w/ 694088 gasket) 797442 Metric Cylinder Head Plate** (w/ 694088 gasket) 694088 Cylinder Head Plate Gasket* 699481 Hex Washer Head Metric Screw (Rocker Cover Bottom - M6 x 1) 555679 Rocker Cover (Black) 499924 Rocker Cover (Silver) 791585 Low Profile Rocker Cover (unpainted, snowmobile applications) 691890 Rocker Cover Gasket 555711 US Rocker Arm* 797443 Metric Rocker Arm** (Both with Briggs & Stratton logo) 555550 Valve Retainer* 26826 Valve Spring* (Intake & Exhaust) 555690 Heat Disperser (Optional) ANIMAL ENGINES 699482 Hex Washer Head Metric Screw* (Cylinder Head - M8 x 1.25) 555737 Spark Plug (Champion RC12YC) 557118 Valve Guide Bushing* (Standard) 555645 Valve Guide Bushing (.002" Over) 555635 Cylinder Head Assembly 555739 Factory Cut Cylinder head (.011 Rule) 555698 Cylinder Head Gasket (Fire Ring) 555723 Cylinder Head Gasket (Standard - LO 206 Engines) 693517 Push Rod 555551 Intake Valve* 555552 Exhaust Valve* 690977 Valve Tappet **Included with 555635 Cylinder Head Assembly *Not interchangeable with metric rocker system parts. 5

ANIMAL carburetor assembly (Engine Model Series 124432 ) ANIMAL ENGINES 555726 Carburetor Locking Cap (206 Program) 555647 Throttle Cable Boot* 555603 Throttle Cable Cap 555596 Throttle Return Spring 555650 Needle Valve Retainer (Contains 5 Clips & 5 Retainers) 555729 Green Air Filter (Standard on LO 206, Optional on Other Models) 555758 Green Air Filter (Snowmobile version*) 555602 Needle Jet (BGB Gasoline) 555649 Needle Jet (DID Alcohol) 808656 Mikuni Fuel Pump 555595 Throttle Cable Cap Gasket* 555717 Choke Cover (Optional) 555691 Needle Jet (Alcohol, Needle only, BHA) 555590 Throttle Valve 555728 Extended Throttle Valve (Jr. LO 206) 555717 Choke Cover Plate 555644 Metric Screw (Carburetor Spacer to Cylinder Head - M6 x 1) 555545 Carburetor Spacer 691885 Intake Gasket* 555586 Idle Speed Kit 555593 Emulsion Tube 555601 O-Ring Seal* 555585 Idle Mixture Kit 555646 Hex Flange Metric Nut/Screw (Carburetor to Spacer - M6 x 1) 555594 Pilot Jet Main Nozzle (Walboro Part Numbers) Gas 86-3231 Alc TS-01174 Available through Walboro 555536 Stock 95 Main Jet (Gasoline - Contains: 30 & 34 mm Pilot Jets: 93, 95, 96, 98 & 100mm Main Jets) 555537 Main Jet (Alcohol - Contains: 1 Alcohol Main Nozzle; 38, 40 & 42mm Pilot Jets: 135, 137, & 140mm Main Jets & 1 Alcohol Needle) 555639 Main Jet (Blank Contains: 5 pcs) 555742 Stock Main Jet 555648 Needle Float Valve 555646 Hex Washer Head Metric Screw/Nut (Carburetor to Spacer - M6 x 1) 555591 Carburetor Float 555775 Pulse fitting (coming in February 15) Not avaliable through Briggs & Stratton Walboro Part Number 96-3127-7 (M4 x.07 x 12) 555592 Float Bowl Gasket 555653 Float Bowl Only available in 555653 Float bowl assembly *555605 Carburetor Overhaul Kit 555776 0 Curved Intake (coming in February 15) 555610 O-Ring Seal* 555659 Carburetor Bowl Drain (Used after Code Date 05053100) 555607 Carburetor Bowl Drain (Used before Code Date 05060100) 555658 Carburetor Assembly (Does not contain 555545 Spacer, 691885 Gasket, Mounting Screws or Main Jets) 6

ANIMAL housing & flywheel (Engine Model Series 124432 ) 555773 206 Stator Lighting System ANIMAL ENGINES (optional) 555681 Magneto Armature (Animal - 12,000 rpm) 555718 Magneto Armature (206-6,100 rpm) 555685 Flywheel & Ignition Kit (includes 692592 (fan) and 699201 x 2 screws) 555725 Magneto Armature *Flywheel only available in kit 698315 Regulator 698314 Stator 810129 Stator Screw (1 pc, 4 needed) (Jr. 206-4,100 rpm) 555683 Flywheel 555719 PVL Magneto Wire (includes 692592 (fan) and 699201 x 2 screws) 699477 Metric Screw (Magneto Armature - M4 x.7) 695630 Stop Wire (Used on Type No. 8002 & 8003) 699201 Screw (Flywheel Fan - M8 x 1.25) 557128 Starter Gear (Includes 4 Pcs. 557129 - Screw, Optional for Electric Start) 555704 Blower Housing 692592 Flywheel Fan 794451 Hex Washer Head Metric Screw (Blower housing M6 x 1) 691736 Flywheel Washer 555731 Hex Jam Nut (Flywheel - M16 x 1.5-6H) 555702 Flywheel Guard 794954 Metric Screw (M5 x.8) 699200 Hex Washer Head Screw (M4.2 x 1.4) 691678 Hex Washer Head Screw (Blower Housing - 5/16-18unc) 555255 Rewind Guard 19584 Flywheel Puller 19433 Flywheel Wrench 692591 Flywheel Cup (Optional) 695287 Rewind Starter (Optional) (Contains 4 pcs - M5 x.8) Starter Kit 557068 Electric Start Conversion Kit Includes 557068 Starter Assembly 557119 Starter bracket 557128 Starter Gear 698039 Starter Drive Cover 7

ANIMAL control bracket & gasket sets (Engine Model Series 124432) ANIMAL ENGINES 206 PARTS 699479 MetricScrew (Control Panel - M6 x 1) 555699 Control Panel *Included with 555631 Engine Gasket Set 798462 Crankcase Gasket* 299819s Oil Seal* (Magneto Side) 555715 Sealed Shortblock 692550 Oil Seal* (PTO Side) 555726 Carburetor Locking Cap 557028 Starting Switch + Included with 555636 Valve Gasket Set 691885 Intake Gasket*+ 694088 Cylinder Head Plate Gasket*+ 555728.285 Junior Throttle Slide 555732 -.310 Junior Throttle Slide 555698 Cylinder Head Gasket*+ (Fire Ring) 555727 Max-Torque Clutch, 3/4 crank, 17 tooth, 35 chain 555728 Junior 206 Throttle slide -.285 Black 555732 Junior 206 Throttle slide -.310 Black 555733 Club Throttle slide -.440 Red 555734 Club Throttle slide -.520 Blue 555735 CA Novice Throttle slide.342 Purple 555740 CA Junior Club Throttle slide -.490 Green 555741 CA Junior National Throttle slide.570 Yellow 555729 Green Air Filter 793379 Stop Wire (Used on Type No. 8003) 692602 Stop Wire (Rocker Switch, Used on Type No. 8001 & 8002) 691890 Rocker Cover Gasket*+ 555718 206 Ignition Module, 6,100 rpm limiter 555725 Junior PVL Ignition Module, 4,100 rpm limiter 8

ANIMAL gear reduction unit (Engine Model Series 124432 ) 690824 Ball Bearing 695087 Timing Gear 792755 Gear Case Gasket 555722 Crankshaft 299819S Oil Seal 555721 Complete Gearbox (minus crankshaft) 555722 Splined Racing Crankshaft 792746 Gear Reduction Case (Includes 299819S Oil Seal) 792760 O-Ring 792749 Oil Level 792759 Vented Hole Plug (3) Oil Fill Hole Plug 555730 Sealing Washer 11 mm 690711 Hex Head Cap Screw (4) (Gear Reduction Cover - M8 x 1.25) ANIMAL ENGINES 792745 Ball Bearing 12 mm 792753 Hex Head Cap Screw (4) (Gear Reduction Case - 5/16-24) 1/2" 792756 Auxiliary Drive Shaft (Internal Gear) 11 mm 792748 Gear Reduction Cover 555757 Steel Gear Hub The use of aluminum gear hubs will result in sungear keyway damage due to insufficient keyway surface area to transfer load and a material weakness that causes the hub to twist under force. 555730 Rubberized Sealing Washer 792745 Ball Bearing 792752 Gear Reduction Seal 792750 Oil Drain Hole Plug 8 mm Vented Oil Fill Plug Position Important: The vented oil fill plug in the cover must mount in the 12 o clock position. IMPORTANT Engine seal must be removed before installing this gearbox. 9

BRIGGSRACING.com facebook.com/briggsracing For support videos, engine carburetor setup and general guides please visit www.briggsracing.com Stop by and take advantage of our racing forums to ask others questions and advice as well! Due to the conditions inherent in racing, Briggs & Stratton does not warrant race engines or parts. MS5701 (REV. D) BRIGGS&STRATTON CORPORATION POST OFFICE BOX 702 MILWAUKEE, WI 53201 USA 414 259 5333 2014 Briggs & Stratton Corporation

206 RACING CLASS STRUCTURE AND SLIDE INFORMATION Briggs & Stratton Racing Class Structure Class Age Weight (Pounds) Engine Package Technical Configuration Cadet.310 Restrictor Junior 206 with carb lock RLV pipe (#5507) Slide (#555728) 4,100 RPM Rev Limiter Novice.342 Restrictor 206 with carb lock RLV pipe (#5506 or 5507) Purple slide (#555735) Junior 1 LEGACY Club -.440 206 with carb lock RLV pipe (#5506 or 5507) Red Slide (#555733) Junior 1 CLUB -.490 Per sanctioning body/ 206 with carb lock RLV pipe (#5506 or 5507) Green Slide (#555740) Junior 2 LEGACY.520 club regulations 206 with carb lock RLV pipe (#5506 or 5507) Blue Slide (555734) ASN Nat. Junior -.570 206 with carb lock RLV pipe (#5506 or 5507) Yellow Slide (#555741) Briggs & Stratton 206 Senior 206 RLV pipe (#5506 or 5507) Stock Slide (#555590) Masters 206 RLV pipe (#5506 or 5507) Stock Slide (#555590) Class.350 Cadet.450 Novice Junior 1 Briggs & Stratton 206 Junior Slide Height Openings.310 Opening.342 Opening.440 Opening.520 Opening Racer Measurement Tool 7.8 mm drill blank (.307) R drill blank (.339) 7/16 th drill blank (.437) 33/64 th drill blank (.516) Engine Speed (rpm) PURPLE SLIDE.342 Opening Corr. Corr. Torque HP (ft-lbs) (hp) 2500 7.25 3.45 3000 6.84 3.91 3500 5.99 3.99 4000 5.09 3.87 4500 4.20 3.60 5000 3.50 3.33 5500 6000 10.00 5.00 0.00 Purple Slide 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Engine Speed (rpm) BLUE SLIDE.520 Opening Corr. Corr. Torque HP (ft-lbs) (hp) 2500 9.06 4.31 3000 9.39 5.36 3500 8.94 5.96 4000 8.19 6.24 4500 7.38 6.32 5000 6.62 6.31 5500 5.37 5.62 6000 4.96 5.67 10.00 5.00 0.00 Blue Slide 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Engine Speed (rpm) RED SLIDE.440 Opening Corr. Corr. Torque HP (ft-lbs) (hp) 2500 8.77 4.17 3000 8.62 4.93 3500 7.88 5.25 4000 6.98 5.32 4500 6.10 5.23 5000 5.22 4.97 5500 4.54 4.75 6000 3.63 4.14 10.00 5.00 0.00 Red Slide 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Engine Speed (rpm) YELLOW SLIDE.570 Opening Corr. Corr. Torque HP (ft-lbs) (hp) 2500 9.45 4.50 3000 9.45 5.40 3500 8.63 5.75 4000 7.94 6.05 4500 7.70 6.60 5000 7.09 6.75 5500 6.45 6.75 6000 5.78 6.60 10.00 5.00 0.00 Yellow Slide 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Engine Speed (rpm) GREEN SLIDE.490 Opening Corr. Corr. Torque HP (ft-lbs) (hp) 2500 8.61 4.10 3000 8.75 5.00 3500 7.92 5.28 4000 7.22 5.50 4500 6.77 5.80 5000 6.20 5.90 5500 5.59 5.85 6000 4.86 5.55 10.00 5.00 0.00 Green Slide 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Engine Speed (rpm) STOCK, UNRESTRICED 206 Corr. Corr. Torque HP (ft-lbs) (hp) 2500 11.13 5.30 3000 11.12 6.35 3500 9.83 6.55 4000 9.76 7.43 4500 9.51 8.15 5000 9.09 8.65 5500 8.45 8.85 6000 7.52 8.59 15.00 10.00 5.00 0.00 Stock Slide 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 These net power curves are to be used as a guide for initial gearing and clutch recommendations. Net performance values have been obtained and corrected in accordance with SAE J1349 Engine Power Test Code - Net Power Rating. Net power values are taken with exhaust and air cleaner installed. These have been obtained from test results of a limited number of engines and have not been proven to be statistically significant. Given the wide array of factors which can affect engine performance such as, but not limited to, final engine trim (air cleaner, exhaust, sanctioning body rule variances), equipment set-up, application limitations, ambient operating conditions (temperature, humidity, altitude), etc. These curves are intended as a reference for gearing and clutch setup only.

Briggs & Stratton Racing Carburetor Tips and Reference Guide Animal, 206, and M-series PZ-22 World Formula PZ-26 Version (REV. -)

PZ CARBURETOR PERFORMANCE TUNING AND MAINTENANCE All information provided is intended for use as a guideline for basic operation, tuning, and maintenance of the PZ slide valve carburetor used on your Briggs & Stratton race engine. Contents: TUNING 1 Idle and Low Speed 2 Midrange/Part Throttle 3 High Speed/Full Throttle 3 TUNING TIPS 4 SET-UP 4 MAINTENANCE 5 SPECIFICATIONS & EXPLODED VIEWS 5 SAFETY NO COMPROMISES. At the end of the day the effort you put into racing directly determines your outcome. You wouldn t compromise on your approach to racing, so why would you with your oil? What if there was an oil engineered specifically for high-revving, air-cooled racing engines, methanol or gas fuels, that gives you the power of a lite oil yet the wear protection of a heavy oil? What if that oil also had the added benefits of wear protection and a corrosion inhibitor to safeguard your investment during, between, and after the season was over? COMPROMISES lead TO WhAT-IF S ANd AS RACERS ThAT ISN T PART OF OuR dna. NO MORE COMPROMISES. INTROduCING ThE BRIGGS & STRATTON 4T Full SYNThETIC OIl CuSTOM ENGINEEREd BY AMSOIl. MAXIMuM horsepower OuTSTANdING WEAR PROTECTION EXCluSIVE SYNThETIC FORMulATION EXhAuSTIVElY TESTEd ON ThE dyno ANd ON ThE TRACK designed FOR high REVVING, AIR-COOlEd RACING ENGINES Briggs & Stratton 4T Racing Oil is available through any authorized Briggs & Stratton Racing dealer. For additional information or to locate a dealer near you please visit www.briggsracing.com. As with any carburetor or fuel system, care must be taken to avoid fire from leaking or spilled fuel. Be sure all gaskets and seals are in good condition and properly assembled. Dispose of any drained or spilled fuel. Check condition of fuel lines and connections before every use. Fuel must be drained from the system if vehicle or engine is not stored or transported in a level position. It is necessary to check the carburetor slide for free movement through the full range of travel any time the carburetor has been removed, installed, or adjusted and before starting the engine. Remove air filter and visually confirm the slide valve is fully closed as the throttle is released. Work the throttle control from closed to fully open and watch for any sticking or hang-up. Engines could start with an open throttle resulting in a runaway vehicle. Always install the correct return spring for the carburetor and use an additional return spring on the throttle pedal as needed. Motorsports are dangerous and can lead to injury or death. Part Number: GBS2960

TUNING Rich and Lean: An internal combustion engine needs a specific ratio or mixture of air and fuel for best performance. This mixture is delivered by the carburetor. In the following discussion numerous references will be made to the air and fuel mixture (air/fuel ratio) being rich or lean. Rich refers to a mixture with an excess of fuel. Lean refers to a mixture with an excess of air. Float height Parts involved: Float Inlet Needle The float height controls the fuel level in the float bowl. This adjustment determines the point at which the inlet needle opens as the fuel level drops in the bowl. Float height is usually measured with the float bowl removed and is specified from the carburetor body to an edge or surface on the float. The float should be resting on the inlet needle but not depressing the spring under the needle stem when this measurement is taken. To adjust, carefully bend the tab where it makes contact with the inlet needle. The float height should be adjusted before any other adjustments are made. A higher fuel level will cause a richer mixture and possibly excess overflow from the vents. A lower fuel level will a cause a leaner mixture and could lead to an engine miss or cut-out while cornering. Start at the specified height and change as needed for best performance on different type of tracks. The float drop should also be checked. The proper adjustment will prevent the needle from pulling too far out of the inlet seat and becoming stuck in the open position. Animal, 206, and M-series World Formula 1

Idle and Low Speed Parts involved: Idle Speed Screw Idle Mixture Screw Pilot Jet (Idle Jet, Slow Jet) Carburetor tuning at idle and low speed is accomplished by adjusting the Idle Mixture Screw, the Pilot (or Idle) Jet, and Idle Speed Screw. These adjustments will control idle speed, idle quality, and initial responsiveness/ acceleration of the engine. The screw in the center of the side of the carburetor body is the Idle Speed adjustment. This screw holds the throttle slide valve open slightly to obtain the desired engine rpm at closed throttle. Turning the idle speed screw clockwise will increase rpm. Turning counter-clockwise will decrease rpm. The Pilot Jet is screwed into the carburetor body and is located inside the float bowl. (See photo, next page.) The Pilot Jet meters the amount of fuel entering the low speed circuit. A larger or smaller jet will change fuel flow accordingly. The size of the jet in millimeters is stamped on it. mixture screw will usually result in the highest rpm with the throttle closed. As the amount of fuel is varied the engine rpm will also vary. With throttle closed and engine warm and running at or slightly above desired idle speed, slowly turn the Idle Mixture Screw in or out to obtain the highest rpm. Then set the idle speed screw to obtain the desired rpm. If a smooth idle cannot be set with the idle mixture screw between ¼ to 2-¼ turns out, or if the engine does not respond to adjustment, a different size Pilot Jet may be needed. The pilot jet, also called idle or slow jet, controls the amount of fuel at idle and throttle positions up to ¼ open. If the mixture needle cannot be leaned out enough, a smaller Pilot Jet should be installed. A larger jet should be installed if the mixture is too lean. The proper Pilot Jet size will allow a satisfactory setting with the mixture screw. World Formula Animal, 206, and M-series The Idle Mixture Screw can be either an air or fuel adjustment so it should be determined what type of change you are making. A mixture screw on the air filter side of the PZ22 carburetor is an air-only adjustment so opening the screw (turning counterclockwise) will increase the air bleed and lean the mixture. The mixture screw on the engine side of the PZ26 carburetor is a fuel adjustment. Opening the screw will allow more fuel into the engine for a richer mixture. For an initial setting, gently turn the mixture screw in until it lightly seats or stops. Back out the specified number of turns. The optimum setting of the 2

Midrange/Part Throttle Part involved: Jet Needle Main Nozzle (Needle Jet) Throttle Slide Valve The Jet Needle primarily controls fuel flow between 10% and 75% throttle opening. The Jet Needle is the long narrow needle in the center of the throttle slide valve. The needle can be seen when the throttle is opened. It is held in place in the center of the throttle slide by a V-shaped clip. The Jet Needle has five notches and a C-clip which determines the position of the needle in the slide based on which notch the clip is placed in. By varying the height of the needle in relation to throttle opening, the amount of taper of the needle in the main nozzle will change the fuel mixture. To richen the part throttle operation, move the clip to the next lower notch. This will hold the needle farther out of the main nozzle and allow more fuel into the air stream. To lean part throttle operation move the clip to the next higher position. The notch at the top of the needle would be considered the first position (leanest). Needle taper reference letters are stamped on the needle for identification. Location of C-clip on jet needle determines midrange fuel mixture. RAISING THE NEEDLE IN THE SLIDE = RICHER MIXTURE LOWERING THE NEEDLE IN THE SLIDE = LEANER MIXTURE Be sure the V-shaped jet needle retaining clip is in place and will hold the jet needle securely in the slide. High Speed/Full Throttle Parts Involved: Main Jet The Main Jet controls the fuel flow at throttle positions of one-half to full throttle. The Main Jet is located inside the float bowl and is screwed into the bottom of the Emulsion Tube in the center of the carburetor body. The jet size or diameter in millimeters is stamped on the jet. A larger diameter jet allows more fuel flow and a richer mixture. Altitude and weather conditions can affect the engine operation enough to require changing the size of the Main Jet. High air temperature, humidity, or altitude could require a smaller Main Jet. Low temperature, humidity, or altitude would require a larger diameter Main Jet. Animal, 206, and M-series World Formula RUNNING THE ENGINE WITH AN IMPROPER MAIN JET COULD RESULT IN A LOSS OF POWER, HIGH ENGINE TEMPERATURES, OR ENGINE DAMAGE. 3

TUNING TIPS Gasoline is the typical fuel used for internal combustion engines. In some racing applications methanol alcohol is used for fuel. When using alcohol the engine must consume approximately twice as much fuel as with gasoline. For this reason some parts need to be replaced for proper tuning. The main nozzle, main and pilot jets, and the jet needle need to be replaced with the proper size. If a carburetor has been working well and then develops a problem, the most likely cause is dirt or contamination in the carburetor. Dirt can plug jets or get stuck in the inlet needle and cause flooding. It will save time in the long run to be sure you are working with a clean carburetor. If the engine performance seems to change or idle/low speed running seems erratic, check for loose carburetor and manifold mounting bolts or leaking gaskets or seals. This can cause a vacuum leak and lean condition. Symptoms of a rich mixture are: Black smoke or popping in the exhaust A flat running engine or dull sound Runs worse as engine warms Symptoms of a lean mixture are: High cylinder head or exhaust temperature Backfire/popping from the carburetor Runs better with partial choke Surging or cutting out Pinging or rattling sound from engine under load The Pilot Jet, Idle Mixture Screw and Jet Needle will have the most effect on acceleration from closed throttle. A slightly rich idle mixture may help acceleration. Moving the position of the Jet Needle clip is a good quick adjustment for a change in air temp. This will help with throttle response and corner exit. The Main Jet will have the greatest effect at wide open throttle but will also affect mid-range operation. After a Main Jet change it may be necessary to move the Jet Needle position for best results. The optimum float height setting may change from track to track. A rough track or an engine misfire in certain corners may require a float adjustment. If the carburetor can be rotated on the manifold, it may help to turn the carburetor a few degrees to compensate for a problem corner or for oval tracks. 4 SET-UP The throttle/pedal ratio is an item that can be tailored to suit the driver s style and benefit overall engine performance. By changing the distance from the pedal pivot to the point the throttle cable or linkage attaches to the pedal, the carburetor action can be slowed down to help throttle control on a slick or rough track or smooth out a choppy driver. IT IS IMPORTANT TO HAVE A FIXED STOP ON THE THROTTLE PEDAL. This will reduce wear on the throttle cable and carburetor. Remove the air filter and visually confirm that the throttle slide reaches the wide open position just as the pedal hits the stop. The slide should also fully close with some slack in the cable with the pedal released. Idle speed cannot be set if the pedal is holding the slide partially open. Seal the pedal end of the cable housing from dirt. Dirt will migrate up the throttle housing especially on a dirt track. Grit or debris on the slide could cause sticking. A rubber cap can be used on the end of the cable housing with a small hole through it for the cable to slide through. A dab of silicone could also be used at the end of the cable housing. The cable housing should also be sealed by the rubber boot on the top of carburetor cap. For the cable hook-up, remove the cover, spring and slide assembly. USE CAUTION while unscrewing the cover as it will have spring tension behind it. Make a note of the orientation of the slide valve. The small groove on the side will align with a small guide pin in the bore. Thread the cable first thru the boot and cover, then thru the center of the spring and finally thru the top of the slide and hook the ball end under the bottom of the slide. (See photo.) The hose attached to the bottom of the carburetor is for fuel overflow from the bowl. It should be routed down for proper draining. Fuel pressure requirements are 1-3 psi.

MAINTENANCE Draining carburetor The carburetor should be purged of alcohol at the end of every day of running. Alcohol is very corrosive and will cause a lot of problems if left in the carb. The fuel line should be unhooked at the carburetor and the bowl drain screw opened to drain any fuel in the system. Another option is to run the engine on gasoline until it stalls. This will flush any alcohol out of the system. The carburetor should also be drained at least at the end of the season when running gasoline. Filters Always use an inline fuel filter to prevent contamination inside the carburetor. Air filters should fit the carburetor properly and be kept clean. Bowl gasket When reinstalling the float bowl you may find the gasket does not fit properly. If the gasket is too small it can be stretched to fit the groove. If it is wet it may swell slightly and can be set aside to dry and return to the proper size. If you are doing a lot of disassembly for tuning it may help to have extra gaskets. Cleaning/Inspection Once a year the carburetor should be disassembled for cleaning and inspection. Look for wear on the jet needle and inlet tip. Inspect and/or replace o-rings and seals. If cleaning is necessary a toothpick will work for clearing any holes such as jets. Remove the Inlet Needle and use a Q-tip to clean the inside of the inlet seat. Compressed air is also useful to remove contamination. The pilot jet has a very small metering orifice. If it cannot be blown out it will likely need to be replaced. Always use a stop on the gas pedal. This reduces wear on the carburetor and the chance of a stuck throttle. SPECIFICATIONS & EXPLODED VIEWS World Formula Main Jet: 96 Pilot Jet: 38 Main Nozzle Diameter: 2.6 Jet Needle: CDB/3rd notch Mixture Screw: 1 turn Float Height: 14mm (.550in) Animal, 206, and M-series Main Jet: 95 Pilot Jet: 32 Main Nozzle Diameter: 2.6 Jet Needle: BGB/2nd notch Mixture Screw: 1 ½ turn Float Height: 22.0mm (.860in) 5

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