PROX Forged Replica Piston Kit engineered for reliable 4-stroke performance with reduced friction and stable thermal expansion. Precision CNC machining helps deliver consistent fit and long service life.
PROX Forged Piston Kit is built for riders and engine builders who want OEM-style fit with the added strength and durability of a forged piston. Made from a specific low-expansion aluminum alloy, it helps reduce friction while maximizing reliability—ideal for demanding 4-stroke motocross and off-road use. Each piston is precision-machined on state-of-the-art CNC equipment for accurate tolerances and consistent performance.
If you're refreshing a worn top end or aiming for dependable performance under heat and load, this kit provides a robust solution with materials commonly used by major Japanese engine manufacturers—helping your engine run smoothly and confidently ride after ride.
