Reproduction. Not for. Briggsracing.com. CORPORATION Briggs & Stratton Corporation MS /08

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1 Briggsracing.com MS /08 BRIGGS&STRATTON CORPORATION Post office box 702 Milwaukee, WI USA Briggs & Stratton Corporation

2 Version 4/08 Racing Performance Catalog & Reference Guide Model/Type:

3 Table of Contents SAFETY...1 WORLD FORMULA 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 Housing & Flywheel Parts Explode...6 Carburetor Assembly Parts Explode...7 Clutch Assembly Parts Explode...8 Starter Assembly Parts Explode...9 Control Bracket & Gasket Sets Parts Explode PZ26 Carburetor Tuning Guide Electric Starting System Wiring Diagram... 12

4 SAFETY SAFETY 1

5 SAFETY Briggs & Stratton does not approve or authorize the use of these engines on 3 wheel all terrain vehicles (ATVs), motor bikes, fun/recreational go-karts, or aircraft products. Use of these engines in such applications could result in property damage, serious injury (including paralysis), or even death. This engine requires special technical expertise and preparation before it can be used in competitive events. 2

6 WORLD FORMULA GENERAL SPECS Model: Type: 8105 Displacement: Cu. in cc Design: Slant, 30 degree, Overhead Valve, Electric Start Bore: / in. Stroke: 2.2 in. Compression Ratio: 9.5 to 1 Factory Timing: 29 degrees BTDC SPECIAL TOOL REQUIREMENTS General Model 12 Manual Part No PVL Flywheel Puller Part No Flywheel Wrench Part No TORQUE SPECS Description Wrench/Socket Size Torque Air Guard 7mm lb-in. ( Nm) Blower Housing 10mm & 3/8" lb-in. ( Nm) Carburetor (to manifold) 10mm lb-in. ( Nm) Connecting Rod T lb-in. (16-17 Nm) Cylinder Head Bolts 10mm lb-in. (20-27 Nm) Exhaust Brace Screws 10mm lb-in. (11-14 Nm) Exhaust Stud 10mm lb-in. (11-14 Nm) Flywheel Nut 15/ ft-lbs. ( Nm) Flywheel Fan 10mm lb-in. (20-27 Nm) Intake (to cylinder) 5mm Allen lb-in. ( Nm) Oil Drain Plug 3/8" lb-in. (11-14 Nm) PVL Module 7mm lb-in. (2.3-4 Nm) Rocker Arm Stud 7/16" lb-in. (10-14 Nm) Rocker Arm Plate 10mm lb-in. ( Nm) Rocker Arm Set Screw 1/8" Allen lb-in ( Nm) Spark Plug 5/8" Deep lb-in. ( Nm) SIde Cover 10mm lb-in. (11-14 Nm) Starter Gear #2 Phillips lb-in. (4-6 Nm) Top Control Plate 10mm lb-in. (8-10 Nm) Valve Cover 10mm Lower & 3/8" lb-in. (3.5-7 Nm) RACING SPECIFICS PVL Ignition Module Gap -.010/.014 (.15/.36mm) Digital Rev Limiter - 7,000 RPM +/- 50 Spark Plug - Champion RG4HC Fuel Requirements - 98 Octane (RON) Recommended Oil Capacity - 16 oz., High Grade 30 Weight (Even for initial break-in) Exhaust System Requirements-50mm x 57mm Flex Coupling, 50/90 Canister Muffler. Starter System Amp Capacity-180 Cold Cranking amps. Refer to your sanctioning body rules for required installation location. OPTIONAL PERFORMANCE PARTS High - G/Force Breather Bypass System - Part No Installing Cylinder Head Plate Adjusting Valve Clearance Feeler Gauge Torque to in-lbs. (6-8 Nm) Torque to in-lbs. (10-14 Nm) Torque to in-lbs. ( Nm) HIGHLIGHTED FEATURES Dual Ball-Bearing, RACING Reinforced Cylinder Billet Rod Slotted, Stelite-Faced, Ground Cam w/ Compression Release Dual, High-Silicon Valve Springs PVL Digital Ignition System w/7,100 RPM Limiter CNC D-Shape Intake Port Walbro Round -Slide Carburetor Dana Fire-Ring Head Gasket Racing Crankshaft w/ Induction-Hardened Crankpin Green Air Filter Federal Mogul Moly-Coated Cam Ground, Barrel-Faced Piston Chrome-Faced, Racing Only Ring Package Port-Liner, Exhaust System Mikuni Fuel Pump Noram Clutch w/ Quick Change Sprocket Set Automotive 3-Piece Valve Retainer System Beefy Rocker Arm Stud Nuts 3

7 WORLD FORMULA cylinder assembly (Engine Model Series ) Repair Manual Breather Assembly (Optional, Also includes Rocker Cover Gasket) Oil Fill Cap Crankcase Gasket Screw (Connecting Rod) Timing Gear Bearing Plug Crankshaft Connecting Rod Piston Assembly (Std., with File to fit Top Ring) Piston Assembly (.10" Over, with File to fit Top Ring) Piston Assembly (.20" Over, with File to fit Top Ring) Piston Assembly (.30" Over, with File to fit Top Ring) Cylinder Shield Metric Screw (Cylinder Shield) Ring Set (Std.) Ring Set (.10" Over) Ring Set (.20" Over) Ring Set (.30" Over) Bushing/Seal Kit Breather Tube Ring Set (.10" Over - Contains 10 Top Rings) Ring Set (.20" Over - Contains 10 Top Rings) Ring Set (.30" Over - Contains 10 Top Rings) Flywheel Nut s Oil Seal (Magneto Side) Cylinder Assembly Locating Pin* Ball Bearing Flywheel Key Connecting Rod Piston Pin S Oil Drain Plug* Oil Drain Plug (Magnetic, Optional) Piston Pin Lock Woodruff Key Camshaft Crankshaft Endplay Shim (Contains.007,.012,.018, &.025) Oil Seal (PTO Side) s Oil Fill Cap Crankcase Cover *Included with Cylinder Assembly (Includes all parts shown) Screw (Crankcase Cover/Sump) Briggs & Stratton Racing Oil (part # ) by Valvoline was specifically co-developed and verified to offer superior protection and performance in our racing engines. It is the only oil recommended and proven for use in our racing engines. Included with Respective Piston Assembly (Includes all parts shown) Included with Crankshaft Included with Piston Pin Included with Crankcase Cover 4

8 WORLD FORMULA head assembly (Engine Model Series ) Hose Connector Hex Washer Head Screw (Rocker Cover Top & Sides) Rocker Arm Adjuster* Rocker Arm Stud* Hex Washer Head Metric Screw (Cylinder Head Plate) Push Rod Guide* Cylinder Head Plate* Cylinder Head Plate Gasket* Hex Washer Head Metric Screw* (Cylinder Head) Stud (Intake Manifold) Nut* (Intake Manifold) Washer* (Intake Manifold) Hex Washer Head Metric Screw (Rocker Cover Bottom) Rocker Arm* Valve Cap* Valve Retainer* Valve Spring* (Intake & Exhaust) Rocker Cover Rocker Cover Gasket* Retaining Ring* (Exhaust) Valve Guide Bearing* (.002" Over) Washer (Exhaust Manifold) Spark Plug Heat Disperser (Optional) Cylinder Head Assembly Cylinder Head Gasket* Exhaust Manifold Exhaust Gasket Stud (Exhaust Manifold) Push Rod Intake Valve* Exhaust Valve* Valve Tappet *Included with Cylinder Head Assembly 5

9 WORLD FORMULA housing & flywheel (Engine Model Series ) Label Kit Magneto Armature Starter Ring Gear (Includes 4 Pcs Screw) Metric Screw (Magneto Armature) Starter Drive Cover (Used on Type No & 8003) N ep o ro t fo du r ct io n Stop Wire Flywheel Screw (Flywheel Fan) Blower Housing Hex Washer Head Metric Screw (Blower Housing) Screw (Starter Drive Cover) Flywheel Fan Hex Jam Nut (Flywheel - M6 x 1.5) Metric Screw (optional) R (Rewind) Cylinder Cover Insert Flywheel Wrench Flywheel Puller Hex Washer Head Screw Hex Washer Head Screw (Blower Housing - 5/16-18unc) Flywheel Puller Rewind Guard Flywheel Cup (Optional) Rewind Starter 6

10 WORLD FORMULA carburetor assembly (Engine Model Series ) Throttle Cable Boot Throttle Cable Cap Throttle Return Spring O-Ring Seal* Carburetor Spacer Clamp (Intake Manifold) Needle Valve Retainer (Contains 5 Clips & 5 Retainers) Nut+ (Carburetor) Idle Speed Kit Intake Manifold Idle Mixture Kit Needle Jet Throttle Valve Air Cleaner Pilot Jet Emulsion Tube Main Jet (Gasoline - Contains: 30 & 34 mm Pilot Jets: 93, 95, 96 & 100mm Main Jets) Needle Float Valve * Carburetor Float Air Cleaner (Water Repellent Cover, Optional) Intake Gasket* Air Cleaner Recharging Kit (Optional) Float Bowl Gasket* O-Ring Seal Carburetor Assembly (Does not contain Carb Spacer, Clamp, Manifold, Gasket, Air Cleaner or Main Jet) * Carburetor Overhaul Kit Metric Screw/Nut Kit (Carb to Spacer) Carburetor Bowl Drain Float Bowl 7

11 WORLD FORMULA clutch (Engine Model Series ) Centrifugal Clutch Assembly (Does not contain Radius Washer ) Snap Ring Clutch Drum Cartridge Springs Kit (Includes 3 Orange & 3 Yellow) Snap Ring Clutch Hub Shaft Clutch Cartridge (Includes Springs) Clutch Thrust Spacer/Bearing Mounting Hardware Raduis Washer (Required for inboard mounting, included with Clutch Assembly) Clutch Gear (17T, #219) Clutch Gear (16T, #219) Clutch Gear (19T, #219) Clutch Gear (18T, #219) 8

12 WORLD FORMULA starter assembly (Engine Model Series ) *Included with Starter Assembly +Included with Brush Retainer End Cap* Screw (Support Bracket) Support Bracket (Starter) Brush Retainer* Brush Set* Starter Housing* Starter Armature* Washer*+ (Brush Retainer) Nut*+ (Brush Retainer) Starter Solenoid Screw* (Starter Motor) Starter Strap Clamp (Starter Solenoid) Pinion Gear Screw (Starter Motor Mounting M8 x 1.25) Starter Drive* Drive Cap* Retaining Ring 9

13 WORLD FORMULA control bracket & gasket set (Engine Model Series ) Metric Screw (Control Panel) Control Panel *Included with Engine Gasket Set + Included with Valve Gasket Set Crankcase Gasket* Fuel Pump Stop Wire (Used on Type No.(s) 8104, 8105, 8106) Stop Wire (Rocker Switch, Used on Type No. 8002) Starting Switch Intake Gasket* Cylinder Head Plate Gasket* s Oil Seal* (Magneto Side) Oil Seal* (PTO Side) Cylinder Head Gasket* Rocker Cover Gasket*+ 10

14 PZ26 Carburetor Tuning Guide Float Height The float height controls the fuel level in the float bowl, which can also effect carburetor performance. Set float height according to specification before any other tuning. The float height may need to be adjusted for best performance on different track types. Idle / Low Speed Tuning of the engine at idle and low speeds is accomplished by adjusting the Idle Mixture Screw or changing the size of the Pilot Jet (also called Slow Jet). The jet size or diameter in millimeters is stamped on the jet (37 =.37mm orifice). The Idle Mixture Screw is a fuel adjustment, so closing the screw or turning it clockwise will lean the fuel mixture, and opening the screw or turning it counterclockwise will richen the fuel mixture. If a smooth idle cannot be obtained with the Idle Mixture screw between 1/4-2 turns out from closed, a different size Pilot Jet may be needed. The proper size Pilot Jet will allow for smooth acceleration from an idle and steady engine speed up to 1/4 throttle opening. Midrange / Part Throttle The Jet Needle primarily controls fuel flow between 1/4 and 3/4 throttle opening. The Jet Needle has five notches and a C-clip on the top of it. To richen the part throttle operation, move the clip to the next lower notch. This will hold the needle farther out of the nozzle. To lean the part throttle operation, move the clip to the next higher position. The highest notch (farthest from the narrow tip) is considered the 1st position. Needle taper reference letters are stamped on the needle for identification. High Speed / Full Throttle The Main Jet controls the fuel flow at throttle positions of 1/2 to full throttle. The jet size or diameter in millimeters is stamped on the jet. Altitude and weather conditions can effect 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. Running the engine with an improper Main Jet could result in a loss of power, high engine temperatures, or engine damage. PZ Carburetor General Specifications Gasoline Main Jet - #102 Pilot Jet - (Slow Jet) #37 Jet Needle - CDB 4th notch Main Nozzle diameter mm Idle Mixture Screw turns out - 1-1/2 Float Height* mm Torque Specifications Bowl Screws in-lbs. Pilot Jet 9 12 in-lbs. Needle Jet in-lbs. Main Jet 9 11 in-lbs. To adjust the Idle Mixture Screw proceed as follows. Turn the Idle Mixture screw in until it lightly seats or stops. Back the screw out the specified number of turns. Warm the engine and set the Idle Speed screw slightly higher than the desired idle rpm. Turn the Idle Mixture screw in or out to obtain the highest rpm. Turn the Idle Speed screw to the desired idle rpm. A slightly rich idle mixture is usually better for acceleration. 11

15 WORLD FORMULA electric starting system (Engine Model Series ) Electric Start Wiring Diagram 12

16 Log Book DATE WORK PERFORMED SEAL NUMBER WORK PERFORMED BY 1/31/08 example: Replaced Air Cleaner DK 13