

PROX offers you a forged piston kit designed for high-performance 4-stroke engines, providing an excellent combination of power, reliability and durability under the most demanding conditions. Made from high-quality forged aluminum, this piston provides optimum resistance to heat, high pressure and wear, while guaranteeing constant engine stability at high rpm. Its precision design improves combustion chamber sealing to optimize compression, combustion and overall engine efficiency. Thanks to its reinforced structure and optimized weight, it promotes rapid rev-up, improved engine responsiveness and longer life for internal components.
Fits on :
YAMAHA WR 400 F 2000
YAMAHA WR 400 F 1999
YAMAHA WR 400 F 1998
YAMAHA YZ 400 F 1999
YAMAHA YZ 400 F 1998
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