ProX Piston Kit for Yamaha MJ50/PW50, 40.00 mm (01.2005.000)

The PROX 01.2005.000 Piston Kit is designed for Yamaha MJ50 and PW50 applications requiring dependable piston performance and precise fitment. Precision machined on state-of-the-art CNC equipment, this piston is manufactured to support consistent operation and reliable service in demanding powersports environments.
The oversized piston option follows the manufacturer’s recommended piston-to-cylinder wall clearances, helping promote proper installation and piston movement when paired with a correctly prepared cylinder. Always verify cylinder condition, measurements, and application compatibility before installation to ensure the correct fit and performance.
This complete PROX piston kit includes the piston, piston ring kit, wrist pin, and circlips needed for a thorough top-end service. Supplied components help simplify installation and provide a coordinated replacement solution for Yamaha MJ50 and PW50 engines. Use the PROX part number 01.2005.000 when confirming compatibility with your motorcycle or replacement-parts requirements.
For best results, install the kit according to the engine manufacturer’s service procedures, including proper cylinder preparation, ring installation, lubrication, and break-in practices. The PROX 01.2005.000 combines precise CNC machining with a complete set of essential piston components for reliable engine maintenance.

Features:

• Precision machining: Manufactured on state-of-the-art CNC equipment for accurate piston construction.

• Application: Designed for Yamaha MJ50 and PW50 models.

• Piston size: 40.00 mm piston option for compatible cylinder applications.

• Clearance compatibility: Oversized option follows manufacturer-recommended piston-to-cylinder wall clearances.

• Complete kit: Includes piston, ring kit, wrist pin, and circlips.

• Brand and part number: PROX 01.2005.000.

Ships from Parts Unlimited.