PROX Cast Piston (Manufacturer Ref: 01.1309.000) — designed for the motocross universe, this aluminium piston provides a reliable replacement solution for vintage two-stroke competition engines. Its domed head and reed machining facilitate the transfer port clearance and adaptation to the cylinder head reeds, while the compression remains in standard configuration to preserve the original engine behaviour.

• Diameter: Ø 66.000 mm (66.00 mm)
• Oversize: Letter A (oversized bore)
• Material: Cast Aluminium
• Compression: Standard
• Specificity: Domed head with reed machining
• Category: Piston — Motocross

Part suitable for rebuilds and restorations where a robust piston with a proven design is sought. Wear references and associated elements to consider during replacement: replacement pin 032042, replacement clips CP1812, and needle cage 400403.

Main compatibilities: HONDA CR 250 R (ME03) 1984 / 1985 (250 cm³). Before installation, check the cylinder bore and recommended clearances to ensure a correct fit and optimal longevity.