The PROX 01.2448.A Forged Piston Kit is a direct-interchange replacement for select Yamaha four-stroke motorcycles. Designed for engines with a Nikasil cylinder and a standard 96.95 mm piston size, this kit provides a reliable alternative to OEM pricing while maintaining the fit and functionality required for proper engine service.
This PROX piston kit is supplied as a complete assembly with the forged piston, piston rings, wrist pin, and retaining clips. The 12.8:1 compression ratio supports the original engine configuration and is intended for compatible Yamaha applications. Always compare the existing piston specifications and follow the manufacturer’s service procedures before installation.
Fitment includes the 2018 Yamaha YZ450F; 2019 Yamaha YZ450F, YZ450FX, and WR450F; and the 2020 Yamaha WR450F. Manufactured by PROX, this kit is identified by manufacturer part number 01.2448.A and vendor part number 19-2448A. It is designed for direct interchange with the corresponding OEM components, making it suitable for engine rebuilding and routine top-end replacement when compatibility is confirmed.
Features:
- Cost-effective alternative to OEM pricing
- Direct interchange with compatible OEM parts
- Complete forged piston kit with piston, rings, wrist pin, and retaining clips
- Standard 96.95 mm piston size for Nikasil cylinders
- 12.8:1 compression ratio
- Fits 2018 Yamaha YZ450F; 2019 Yamaha YZ450F, YZ450FX, and WR450F; and 2020 Yamaha WR450F
- Brand: PROX
- Manufacturer part number: 01.2448.A
- Vendor part number: 19-2448A
Fitment:
2018 Yamaha YZ450F
2019 Yamaha WR450F
2019 Yamaha YZ450F
2019 Yamaha YZ450FX
2020 Yamaha WR450F