ProX 01.4285.B Racing Piston Kit with Rings and Pin

The ProX 01.4285.B piston kit delivers precision-engineered performance for motorcycles, ATVs, personal watercraft, scooters, and mopeds. Each piston is CNC-machined from the same low-expansion, low-friction aluminum alloy trusted by major Japanese engine manufacturers, ensuring optimal thermal stability and reduced cylinder wear.

Complete Kit Includes:

• Precision-machined piston
• Piston rings
• Wrist pin
• Circlips

Key Features:

• State-of-the-art CNC machining for exact tolerances
• Low-expansion alloy reduces piston-to-cylinder clearance changes during temperature cycling
• Low-friction coating minimizes power loss and extends engine life
• Available in standard and oversizes up to 2mm for multiple re-boring options
• Plated cylinder versions offered in A, B, C, and D+ oversizes
• Ready to install—complete kit arrives with all necessary components

ProX Racing Parts piston kits provide OEM-quality replacement solutions that extend cylinder lifespan through multiple rebuild cycles. The extensive oversize availability makes this an economical choice for engine rebuilds, allowing mechanics to bore cylinders multiple times before sleeve replacement becomes necessary.