PROX Cast Piston (Manufacturer Ref: 01.1309.000) — designed for the motocross world, this aluminum piston offers a reliable replacement solution for vintage competition two-stroke engines. Its domed head and reed machining facilitate the clearance of transfers and adaptation to the cylinder head louvres, while the compression remains in standard configuration to maintain the original engine behavior.

• Diameter: Ø 66.000 mm (66.00 mm)
• Oversize: Letter A (oversized bore)
• Material: Cast aluminum
• 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 components 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 proper fit and optimal longevity.