
PROX Cast Piston (Manufacturer Ref. 01.4221.A) — Designed for off-road competition, this cast aluminum piston is aimed at motocross riders looking for a robust replacement part that meets factory specifications. Its domed head and skirt equipped with two lubrication holes on the exhaust side cater to the needs of a 125cc 2-stroke engine under intensive use.
Ideal part for restoring a KX125 top-end (2000 to 2002 series): check the cylinder size before installation. Associated part references for a complete replacement: rings 260238, clips CP1510, needle cage 400413, and top-end gasket kit 602135.