PROX Forged Piston (manufacturer ref. 01.7223.B): a replacement part designed for trail/cross and roadster engines. Made from aluminum with a domed head, this piston meets factory specifications for a replacement equivalent to the original equipment. Ideal for engine modifications and rebuilds where the B oversize and precise diameter are crucial.

• Diameter: Ø 53.95 mm (53.950 mm)
• Oversize Letter: B
• Compression: standard
• Material: aluminum
• Specificity: domed head
• Surface treatment aimed at reducing friction between piston and wall

This piston fits several 125 cc models; examples of compatibility:

• TM RACING MX 125 (2024)
• EVO-SET XC125R (2015)
• TM RACING EN 125 FI (2024)

Associated wear part references to consider during replacement: rings 260343, pin 032026, circlips CP1510, and needle cage 400413. Before installation, check the bore, adhere to the oversize specification, and follow manufacturer recommendations for piston-ring clearance and break-in to ensure long-lasting and trouble-free operation.