ProX 01.1660.050 4-Stroke Piston Kit 100.50mm 0.50mm Oversize 8.3:1 Compression

The ProX 01.1660.050 is a complete 4-stroke replacement piston kit sized at 100.50mm — a 0.50mm oversize bore — with an 8.3:1 compression ratio. Engineered as a high-quality OEM-grade alternative, this kit delivers the precision and reliability needed for a confident engine rebuild.

ProX pistons are CNC-machined using the same low-expansion, low-friction aluminum alloy specified by major Japanese powersports engine manufacturers. An OEM-style tin coating on the piston skirt aids the break-in process and helps reduce long-term friction for extended component life.

Kit Includes:

• Piston
• Piston rings
• Wrist pin
• Circlips

Key Specifications:

• Bore diameter: 100.50mm
• Oversize: +0.50mm
• Compression ratio: 8.3:1
• Engine type: 4-Stroke
• Construction: Cast aluminum alloy

ProX sleeved-cylinder piston kits are available in standard size and a wide range of oversizes — up to 2mm — giving you maximum re-boring flexibility to extend cylinder service life. All components are manufactured at state-of-the-art facilities by OEM-certified suppliers, then verified against ProX's strict quality standards.