Wingless A-Class Clash

ENGINES RULES
600cc, NO 636’s, 4-cylinder 4 stroke as comes on a stock production bike for public sale in the U.S.A. No current year production engines. Except as noted, all internal and external engines parts must remain stock with no modifications, metal removal, or blueprinting. Valve seat inserts may be reworked. Valve springs maybe shimmed with standard or aftermarket shims. Cylinder head combustion chambers may be cleaned by bead blasting with valves seated in place. Cylinder head gaskets may be replaced only with original equipment manufacturer’s stock parts (all 3 layers of the head gasket must be used). All other gaskets may be replaces with duplicate aftermarket parts. Light cleaning of gasket surfaces with steel wool, Scotch-Brite, etc. is allowed. Transmission gears may be shimmed only for the purpose of proper engagement. Standard or aftermarket shims may be utilized. Aftermarket cam chain tensioner allowed for safety of motor. Electronic fuel injection allowed, mechanical injection allowed using stock throttle bodies ONLY, MUST BE 600 Suzuki on Suzuki, 600 Yamaha on Yamaha etc. NO MIXING OF MANUFACTURES. Fuel injection engine may run carburetors. Injected with power commander allowed gas or alcohol. NO timing modules allowed. Fuel injection engines running carbs may change all fuel metering devices to tune fuel curve. Billet intake boots allowed. Modification of oil pan & pick up allowed or aftermarket ok. Modification to thermostat cover allowed or aftermarket ok. Modification to water pump cover allowed or aftermarket ok. Any air box, stock appearing CDI, aftermarket washable replacement air filter, power commander on fuel injection models only. Any 600cc OEM CV carburetors (no flat slides allowed). Stock ECU, PE3-IG2 & PE3-8400 Engine control units are permitted for use with carburetors & Stock Fuel Injection. Fuel cell securely mounted. Tank used for heats must remain for all events. NO flammable liquids allowed in cooling systems.