ProX Piston Kit for Yamaha WR250 and YZ250 (01.2314.B)

The PROX 01.2314.B Piston Kit is an OEM replacement solution for select Yamaha WR250 and YZ250 applications. Manufactured in Japan, this piston kit is designed to provide dependable fitment, consistent performance, and long service life for powersports engine rebuilds and maintenance. Its 67.95 mm piston is engineered for riders, technicians, and builders seeking a high-quality replacement component from a trusted aftermarket manufacturer.
The piston is cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications. This material provides a strong, durable foundation for demanding engine operation while supporting reliable heat management and performance. After casting, the piston is CNC-machined to extremely close tolerances, helping promote proper installation and dependable operation when used with compatible Yamaha engine components.
This complete PROX piston kit includes the piston, ring kit, wrist pin, and circlips required for the piston assembly. Supplying these essential components together simplifies the rebuild process and helps ensure that replacement parts are matched for the application. Always verify engine compatibility, service requirements, and installation procedures before assembly to support correct fitment and performance.
Feature: Manufactured in Japan for consistent quality and precision.
Feature: OEM replacement design for select Yamaha WR250 and YZ250 applications.
Feature: Cast from high-silicon-content aluminum alloy meeting or exceeding OEM specifications.
Feature: CNC-machined to extremely close tolerances for accurate fitment.
Feature: Kit includes piston, ring kit, wrist pin, and circlips.

Features:

• Manufactured in Japan for consistent quality and precision.

• OEM replacement design for select Yamaha WR250 and YZ250 applications.

• Cast from high-silicon-content aluminum alloy meeting or exceeding OEM specifications.

• CNC-machined to extremely close tolerances for accurate fitment.

• Kit includes piston, ring kit, wrist pin, and circlips.

Ships from Parts Unlimited.