HYPER RACE KIT FOR YAMAHA ZUMA 1 BW'S (VERTICAL ENGINE)

Includes: Shaped, domed cylinder head, state of the art cylinder with special porting, lighter flat top piston assembly (all of which are designed for higher compression and improved combustion efficiency), forged crankshaft assembly with larger 12mm wrist pin, top end gasket set, 19mm Dell'Orto carburetor, carbon reed valve petals, throttle cable, and Athena racing exhaust system. Replacement of clutch rollers and springs may be needed for proper tuningCylinder kits include cylinder, head, piston assembly, reeds, and gasketsPiston kits include piston, rings, wrist pin, and circlipsCarburetors have a manual choke assembly and include a selection of main jetsHyper Race crankshafts have a lighter connecting rod, full crank rounds, and special needle bearings, but will not work with OEM type stock or standard Athena big bore pistons due to the larger 12mm wrist pin size.