Prox Forged Piston kitRef : PRO00300A / 1095625002

PROX Forged Piston — manufacturer reference 01.2427.B. Designed for modifications and replacements on cross models, this PROX forged aluminum piston is intended for Yamaha YZ/WR 426 F riders (2001-2002) and other compatible 426 cm³ engines.

• Brand: PROX
• Category: Piston (Cross)
• Diameter: Ø 94.960 mm (Ø 94.96 mm)
• Piston Compression: Standard
• Oversize Letter: B
• Material: Forged Aluminum
• Number of Segments: Kit (segments included)
• Replacement Segments: 260127

The PROX forged piston provides the machining precision necessary to achieve a proper cylinder/segment calibration after disassembly. Its forged aluminum construction ensures a part with controlled tolerances, suitable for off-road conditions. The oversize letter B indicates the appropriate oversize for the corresponding bore: always check the condition of the cylinder and measurements before installation.

Primarily compatible with:

• YAMAHA YZ 426 F (CJ01) 2001–2002
• YAMAHA WR 426 F (CJ02) 2002

Workshop tips: check the bore, replace segments if necessary (ref. 260127), follow installation recommendations and engine break-in procedures. A reliable replacement part for engine restoration or maintenance.