Prox Forged Piston kitRef : PRO00317A / 1121740002

PROX Forged Piston (manufacturer part number 01.6353.B) designed for the motocross universe. Machined from a specific aluminum alloy and produced by forging, this piston aims to provide mechanical durability suited to the demands of off-road circuits while minimizing friction for enhanced reliability.

• Diameter: Ø 87.97 mm (Ø 87.970 mm)
• Compression: Standard
• Oversize Letter: B (intended for corresponding oversize cylinders)
• Material: Aluminum
• Number of Rings: Kit (piston delivered with rings)

The forging process gives the piston a more homogeneous structure than cast iron, which improves mechanical resistance against the repeated stresses of motocross. Its finish and controlled diameter facilitate installation and the checking of piston/cylinder clearance. Ideal for engine preparation interventions, it is aimed at mechanics and riders looking for a robust wear part that complies with original/reworked dimensions.

Compatible Motorcycles (examples): KTM 350 SX-F (2025 – 350 cm3), HUSQVARNA FC 350 (2025 – 350 cm3), GAS GAS MC 350 F (2024 – 350 cm3). Before installation, check the oversize specification and perform the recommended break-in and wear checks.