Prox Piston kitRef : PRO00437A / 1129310001

PROX Piston Kit – Ref. 01.2321.D

Designed for off-road use, this PROX piston kit provides a precisely machined engine part for 250 cm³ displacements. Forged from aluminum and presented with a diameter of Ø 66.380 mm (oversize D), the piston features a dome geometry and standard compression, characteristics sought after for motocross engines where robustness and consistency are essential.

• Material: Aluminum
• Diameter: Ø 66.380 mm (oversize letter D)
• Compression: Standard
• Specificity: Dome design

Each piston is machined to ensure a controlled clearance with the cylinder and good performance under high RPM demands. The kit includes the necessary rings, piston pins, and clips for installation, making it easy to restore or prepare the engine. Aimed at demanding riders and mechanics, it is particularly suitable for competition-oriented recreational and training vehicles.

Delivery contents: pistons, rings, piston pins, clips.

Compatibility (examples): YAMAHA YZ 250 (2026, 250 cm³), YAMAHA YZ 250 (CG23) (2023, 250 cm³), FANTIC XX 250 (2023, 250 cm³). Please check the exact match with your engine before installation.