
PROX Forged Piston — Manufacturer Ref: 01.2421.200
Forged piston designed for high engine reconditioning of motocross bikes. Made from forged aluminum for superior mechanical strength and material homogeneity compared to cast, this piston is supplied with a ring kit for a complete restart during a rebuild. Ideal for interventions on 426 cm³ engines listed below.
This piston is aimed at riders and mechanics looking for an original PROX part to restore the bore after wear or during a preparation. Please respect manufacturer tolerances and check the piston-cylinder clearance, adjust the pin, and install the rings before use. Suitable for the listed models but verify complete compatibility with your engine before purchase.
Compatible motorcycles (examples):