Swainsboro Predator Rules

Transcription

1 Swainsboro Predator Rules These rules are intended to keep the engine as Stock Out of The Box as possible. There are NO gray areas. If they do not specifically state that something is allowed, it will automatically be Illegal. All parts must be FACTORY production parts unless noted. All parts will be compared to OEM Predator parts..should any parts that are in question arise that are not clearly addressed in these rules, it is the duty of the racer to obtain clearance from Local Track inspector PRIOR to the race. If in the opinion of the local track officials the intent of the modification was a performance gain, the track officials have the right to disqualify racer from all classes entered that night..all parts must remain stock and in stock location. Official Spirit and Intent discretion will override any rules mentioned below. If there is not a measurement given below, it MUST BE STOCK. If it does not say below you can add or take off, it Must Be Out of The Box..All OEM casting marks must be visible. All Factory stampings must be visible at time of inspection.(no TUMBLING).No interchanging of parts from different models.local Track reserves the right to swap any part/complete Engine off the motor being raced with a part off of a motor/whole Engine at ANY given time during the race. Track may take any class and swap engines among entries in mentioned class also. Motor can be teched and original owner will be DQ d if deemed illegal. Engines (CAN) be swapped back afterwards.. If said motor is entered in more than 1 class the track will have a system in place to identify mentioned engine after completion of event..track has option to update these specs on the Predator engine if any changes are found off of a OEM out of the box engine..fuel Tank must be stock location, No pumps allowed. Lid must be taped closed. Fuel pickup tube must be stock location and original size OD. And ID.(Track Option) AirBox Stock. No paper filter style airbox allowed. Air can only enter engine through main inlet passing through OEM foam filter material. Must pass combustible spray test. (WD40 or Ether,etc.) No adding or removing material..timing: 15 degrees ( -5+1).Combustion Chamber 29 CC with Tech Plug installed.cc Head 18cc with specific spark plug installed. IGNITION. Kill switch and low oil sensor can be disassembled. Box Stock Only Coil

2 .Stock Flywheel Only 5lbs 4 oz. Minimum or min..flywheel fins must remain stock by number of fins and length of fins. Plastic fins only..stock Flywheel Key must be present. No Offset allowed..blower Housing OEM. Pull start must be attached at completion of race. No Taping of Blower Housing. CARBURETOR: AKRA Rules Except as Noted HUAYI or RUI*ING or SP Plates must have gasket on both sides..low Speed Hole in Carb..092 no go.hole in LOW Speed Jet Holder:.103 NO GO.LOW Speed Jet:.019 No GO/Both O-rings in stock location. Bottom O-ring cannot enter.265 No Go Hole.245 No depth in casted Low Speed Jet holder on carb.low side air choke:.056 NO GO.047 Must Go.High Speed air choke:.042 Must Go.056 No Go.MAIN Jet.030 NO GO Length.340(+-.005) Must Be Tight against E Tube E Tube Inside Hole.066 NO GO (Cannot Enter Either Side).Pick up Main Jet.091 NO Float Seat.061 NO GO.Holes behind welch plug on low speed side exit must be unaltered.027 max.throttle Shaft.115 butterfly.231 shaft min. (NO REAR OFFSET).Butterfly: Part# on right side/must be present.screw in Butterfly shaft.274 minimum length.phenolic plate thickness.265 min. Bolt holes.030 max. All AKRA rules apply. VALVE TRAIN AKRA Rules Except As Noted.No sealer allowed on valve cover..rocker Arm Adjuster Nut.825 long.491 diameter

3 .45 degree I and X valve No Flat Top Valves OEM material.intake Valve Dia Length (Seal allowed.027 max only 1)..Exhaust Valve Dia Stock Lash Cap Present (Seal Allowed.027 max. only 1).Valve Stem I and X No Polishing or Crosshatching SPRINGS and RETAINERS AKRA except as Noted AND meet.950 installed Height as raced..retainer: X=.250min (Lip.065 I=.230min (Lip.095 CAM.Stock Predator cores only. Factory Stamping visible to match Model and Serial number.. EZ spin assembly must be present and as installed at factory.length of Journal.439 long.558 diameter Journal.Plastic Gear R J8 1-1 PA66 Base Circle Duration: I (.050) 206 (.200) 71 Cam Lift: I 223 x 230 Duration X (.050) 210 (.200) 84 Valve Lift: I 232 X 237.Metal Gear: Base Circle:.985 (+-.003) Duration: I (.050) 188 (.200 )61 Cam Lift: I 220 X 220 Duration: X (.050) 220 (.200) 73 Valve Lift: I 228 X228.HEADER: Pipe can be wrapped but not muffler. Must Double nut long.685 max id nipple..750 od pipe max. RLV B-91 mini onlypart# Muffler not mandatory but if raced must meet AKRA specs. MUST be able to unscrew from pipe to measure inside baffles. No sealer permitted. All AKRA dimensions on exhaust holes apply..oem GASKET MATERIAL ONLY/No Copper No aluminum Steel Gasket permitted. Must pass 29cc check either way

4 .HEAD: Middle of Valves Min.292 (Not to vary.005 from one side of valve to opposite. Gasket lip must be visible. NO BSP Clone Heads allowed. DO NOT SINK VALVES. Valve Guide-.220 no go Seat- I.880 X.850 NO PORTING OR ADDING MATERIAL OR ALTERING CASTING MARKS BEARINGS: Steel Balls only (8) No ceramic bearings. BORE max.stroke NO PISTON POP OUT.PUSH RODS Original Material long.157 diameter.190 Ball Diameter CRANK MUST BE STOCK Journal Min max Weight 3.840(DECIMALS).PISTON.050 dish Z Arrow facing pushrod skirt 1.43 Short Skirt Piston must be unaltered in any way. Measurements and locations of Ring Lans must be stock.. WRIST PIN length.790 od.540 id.100 decimal wgt Piston 3rings.375 wgt Piston, Rings, Rod, Cap, Bolts, Pin.780 wgt..rings Top Ring.012 gap MAX Markings on Top(SH).109Wide.059Thick Middle Marking on Top Bevel Top inside (SH).109Wide.059Thick Bottom Ring Must be present 3pcs not broken ALL RINGS MUST BE UNALTERED Top 2 Rings must support own weight in block and take shape of block. Bottom Rings must support weight of complete rod assembly..rod 2 RTC-01 Z connected.160 oil hole Stock Rod Only.WRIST PIN length.709 od.540 id Wgt LIFTER long.928 dia. Lifter Bore Max.320.Block*R210 Gasket Lip must be visible.coil Z TD03 4D Pattern for part number

5