PROX Forged Piston Kit for 4-stroke engines, built from a low-expansion forged aluminum alloy to reduce friction and maximize reliability. Precision CNC machining delivers consistent fit and performance for demanding rebuilds.
PROX Forged Piston Kit is designed for riders and engine builders who want dependable performance and long service life from a top-end rebuild. Made from a specific low-expansion forged aluminum alloy, it helps reduce friction and supports high reliability under heat and load. Each piston is precision CNC-machined on modern equipment for accurate tolerances and consistent results.
If you’re refreshing a worn top end, chasing consistent compression, or simply want a quality forged replacement, this kit provides a reliable solution with materials comparable to those used by major Japanese engine manufacturers.
