PROX

PROX OEM-replacement piston kit made in Japan for 250cc 2-stroke engines. High-silicon aluminum alloy and CNC machining deliver tight tolerances and reliable performance.

• 66.40 mm bore / 66.37 mm piston (Standard Size D)
• Moly-coated skirt for reduced friction and wear
• Includes piston, ring kit, wrist pin and circlips

PROX 4-stroke piston kit for 450 cc engines, designed for a precise, reliable top-end refresh. CNC-machined from low-expansion, low-friction aluminum alloy for consistent performance and long service life.

• Includes piston, rings, wrist pin & circlips
• 95.00 mm bore / 94.97 mm piston size (Standard)
• 12.5:1 compression ratio

PROX 4-stroke piston kit designed for reliable top-end rebuilding and consistent compression. CNC precision machining and a low-expansion, low-friction aluminum alloy help maintain performance and durability under load.

• Complete kit: piston, rings, wrist pin & circlips
• 95.00 mm bore / 94.95 mm piston size (450 cc)
• 12.5:1 compression ratio (standard size A)

Refresh your 4-stroke top end with this PROX piston kit, precision CNC-machined for reliable fit and long service life. Made from a low-expansion, low-friction aluminum alloy to help maintain consistent performance.

• Complete kit: piston, rings, wrist pin & circlips included
• Specs: 95.00 mm bore (Std), 94.96 mm piston, 12.5:1 compression, 450 cc
• Material: aluminum alloy, non-coated skirt, Standard Size B

PROX 4-stroke piston kit for reliable top-end performance and OEM-style fit. CNC-machined from a low-expansion, low-friction aluminum alloy for consistent running and durability.

• Kit includes piston, rings, wrist pin & circlips
• Bore size: 96.00 mm (piston size: 95.97 mm)
• Compression ratio: 12.0:1 (450 cc, standard size A)

Refresh your 4-stroke top end with a precision PROX piston kit designed for reliable power and consistent fit. CNC-machined from a low-expansion, low-friction aluminum alloy for long-lasting performance.

• Kit includes piston, rings, wrist pin & circlips
• Bore size: 77.00 mm (piston: 76.97 mm), 250 cc
• Compression ratio: 13.5:1 (standard size B)