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| Class Specs Go-Kart classes: All go-kart classes are WKA rules and regulations. Mini Micros: Rules will be posted 125/250 Rookie and Regular Micros: Rules will be posted 600 micros 600cc Micro Sprint Universal Engine Rules 600cc Micro Sprint Universal Engine Rules 1. Terms and conditions • Internal Stock parts – must use original manufacturer parts for the particular year and make engine except where noted. No mixing of parts from different year and make engines, even if made by the same manufacturer. Nonstock external bolt on parts may be used (example: billet oil pan, starter, water pump cover, oil cooler, pipes, etc.) 2. Overall Engine • Must be a Production Motorcycle Engine, 4 cylinder, 4 stroke • No current year engines • No Titanium anywhere in or on the engine, unless it comes stock form manufacturer of engine on the production bike • Must have engine, clutch, and transmission all in one unit • Must be Chain Drive 3. Bore and stroke • 600cc Maximum for engine model that was new in 2006 and up. Other engines are 637cc maximum. Engine model is defined as a manufacturer redesign of overall engine. See list at end of rules. • Standard Stroke only (no strokers) 4. Head and cams • NO PORTING, Blending the Bowls, or Blending the Valve Seats (exhaust or intake) Valve jobs are acceptable. • Cams do not need to be stock, but the lift must be no greater than stock. (duration is open) • Cam timing may be adjustable • May use any valves, but they may be no larger than stock valves. • Head may be resurfaced • Any head gasket may be used 5. Pistons • Any Piston may be used, must be within cc limit specified under bore and stroke 6. Bottom End • No machining to remove weight from the crank (no after-market cranks) (no lightweight cranks) • Stock connecting rods must be used (after-market rods are permitted) • Aftermarket rod bolts may be used 7. Clutch/Transmission • The clutch does not need to remain stock, but must remain operable • Transmission gears must be stock, no close-ratio gears or nonstandard gearratios • All gears must remain in transmission, no removing any gears. 8. Ignition • Stock Rev Limiter must remain intact. No hot ECU boxes, no modified ECU boxes. Factory race boxes are ok, but must have the rev limit set to the street bike stock rev limit. If a computer is hooked up to check the ECU it must be set to factory stock specifications, no tolerance. See list at end of rules for RPM limits. • All cars must have the PA standard connector for the track to check engine rpm rev limit. These are available from the chassis manufactures and engine builders, and at the track. All cars must leave intact the rpm wire coming from the ECU. • Stock appearing ignition must be used (no after-market ignition systems, factory race ignitions are ok) may use different year ignitions from same manufacturer as long as stock rev limit of engine (not ignition) is retained. • No aftermarket coils • Engines that came with stock fuel injection may use an after-market add ons (example: Power Commander, Dim Sport) to adjust the fuel curve and/or timing (essentially the same as adjusting jetting and using an ignition advancer). • Ignition advancers may be used 9. Induction system • No mechanically forced induction (turbo charging, supercharging) • Any carburetors may be used on any engine, regardless of year of engine. • If the engine did not come from the factory with fuel injection, fuel injection may not be used. • If the engine came with factory fuel injection, the fuel injection may be used and may be converted for use with alcohol. The stock fuel injection throttle bodies must remain, but may be modified for use with alcohol. Any number of injectors may be used regardless of stock number of injectors. 10. Exhaust • Any exhaust may be used, as long as there is a muffler included with the system that will keep noise levels within individual track limits. 11. Charging system • The stock original factory charging system may not be removed, and must remain in complete working order. No factory racing charging systems. 12. Self Starting • The engine must self-start at the beginning of the event. If it does not selfstart, the car may be pushed off and must start at the rear of the event as the penalty. 13. Fuel • Alcohol or gasoline may be used (if gasoline is used, a fuel tank bladder must be installed for safety purposes) • Fuel Bladders will be mandatory in all cars starting in the 2009 racing season 14. Minimum weight • Minimum weight at all times is 775 pounds, car and driver. If weight is added it must be firmly bolted in place. Engine Model Year Rev Limit Tach Wire Color Kawasaki ZX-6R, ZX-6RR 03-04 14,400 Light/Blue Kawasaki ZX-6R ZX-6RR 05-06 14,800 Light/Blue **Kawasaki ZX-6R 07 15,000 Light/Blue Yamaha R6 03-05 15,500 Yellow/Black Yamaha R6S 06-07 15,500 Yellow/Black same engine as 03-05 R6 **Yamaha R6 06-07 16,000 Yellow/Black Suzuki GSXR 04-05 14,600 Yellow/Blue **Suzuki GSXR 06-07 15,000 Yellow/Blue Honda CBR F1-F3 90-98 13,200 Yellow/Green Honda CBR F4 99-04 13,900 Yellow/Green Honda CBR RR 05-06 15,000 Yellow/Green **Honda CBR RR 07 15,500 Yellow/Green **= Must be 600cc |  | ||||||||||
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