Increase engine compression ratio to 13.0:1 from 11.9:1. Piston is forged aluminum with machined valve pockets for additional valve clearance when used with higher lift camshafts. Offers 1.5 to 3 HP increase throughout most of the powerband. Weight is same as stock so no crank rebalancing is necessary. Includes piston rings, piston pin, and clips (uses stock replacements). GYTR Top End Gasket Kit (GYT-5TG04-10-00) required for installation.
*This accessory may be restricted to closed-course use. This performance accessory does not meet California standards for off-road recreational vehicle usage.
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Manufactured By: Yamaha |