PROX Forged Piston Kit built for reliable 4-stroke performance with reduced friction and long service life. Precision CNC-machined from a low-expansion forged aluminum alloy used by major Japanese OEMs.
PROX Forged Piston Kit is designed for riders and engine builders who want dependable 4-stroke top-end performance with OEM-level consistency. Made from a specific forged aluminum alloy, it helps reduce friction while maximizing reliability—ideal when you need a piston you can trust under heat and load.
Because the piston uses a low-expansion, low-friction alloy (the same type used by major Japanese engine manufacturers) and is precision CNC-machined on modern equipment, you get accurate fitment and stable performance across operating temperatures. It’s a great choice for rebuilding a worn top end or refreshing an engine to restore crisp power delivery and compression.
