Upgrade or rebuild your 4-stroke top end with the PROX Forged Replica Piston Kit, engineered for low friction and long-term reliability. CNC precision machining and a low-expansion forged aluminum alloy help maintain consistent performance under load.
PROX Forged Piston Kit is built for riders who want dependable performance from a 4-stroke engine rebuild. Made from a specific forged aluminum alloy designed to reduce friction and support reliability, this piston helps your engine run smoother and stay consistent when temperatures and loads rise. Precision CNC machining ensures accurate tolerances for a quality fit—ideal when refreshing a worn top end or restoring crisp power delivery.
By using the same low-expansion, low-friction piston alloy trusted across major Japanese engine manufacturers, this kit helps maintain stable clearances and reduces the risk of performance drop caused by heat expansion. It’s a strong choice for motocross and enduro riders who demand durability without sacrificing responsiveness.
