ProX Piston Kit for Kawasaki KX250, 66.36 mm (01.4322.C)

The PROX 01.4322.C Piston Kit is designed as an OEM replacement for Kawasaki KX250 applications. Manufactured in Japan, this piston kit is engineered to deliver reliable fitment, consistent performance, and durable service for motocross and off-road riding conditions. Its 66.36 mm piston size is suited for compatible KX250 engine configurations, providing a precise replacement solution for engine rebuilding or maintenance.
Cast from a high-silicon-content aluminum alloy, the piston is built to meet or exceed OEM specifications for strength, dimensional stability, and dependable operation. The alloy construction helps support performance under demanding engine temperatures and repeated high-RPM use. Each piston is CNC-machined to extremely close tolerances, promoting accurate fitment and smooth interaction with the cylinder, rings, wrist pin, and related engine components.
The complete PROX kit includes the piston, ring kit, wrist pin, and circlips for a convenient engine rebuild. Supplied components help simplify installation while supporting proper replacement of key piston assembly parts. Verify engine year, model, bore specification, and manufacturer requirements before installation to ensure compatibility with your Kawasaki KX250. Use appropriate assembly procedures and confirm all clearances according to the applicable service documentation.

Features:

• OEM replacement design for compatible Kawasaki KX250 applications

• Manufactured in Japan for consistent quality and dependable performance

• Cast from high-silicon-content aluminum alloy

• Meets or exceeds OEM specifications

• CNC-machined to extremely close tolerances

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

• 66.36 mm piston size

Ships from Parts Unlimited.