PROX 4-stroke piston kit designed for reliable top-end rebuilding and consistent compression. CNC precision machining and a low-expansion, low-friction aluminum alloy help maintain performance and durability under load.
This PROX 4-stroke piston kit is built for riders who want a dependable, OEM-style top-end refresh with precise fit and stable performance. Manufactured with a low-expansion, low-friction aluminum alloy and precision CNC machining, it helps restore strong compression and smooth engine operation—ideal when you’re rebuilding a worn top end or doing preventative maintenance.
Because the kit includes the key installation components (piston, rings, wrist pin and circlips), it streamlines your rebuild and helps ensure correct parts matching for a clean, efficient assembly.
