PROX 01.2439.B Piston Kit for Yamaha 19-2439B

The PROX 01.2439.B Piston Kit, SKU 19-2439B, is designed for listed Yamaha applications and features a forged piston for a Nikasil cylinder with a 13.8:1 compression ratio. The kit interchanges directly with OEM parts and offers an alternative to OEM pricing.

This complete piston kit includes the piston, rings, pin and clips. It fits the 2019 Yamaha YZ250F; 2020 Yamaha WR250F, YZ250F and YZ250FX; 2021 Yamaha YZ250F, WR250F and YZ250FX; and 2022 Yamaha YZ250F, YZ250FX and WR250F.

Features:

• Direct OEM interchange: Designed to interchange directly with OEM parts.
• Complete piston kit: Includes piston, rings, pin and clips.
• Forged piston: Forged piston design for a Nikasil cylinder.
• Compression ratio: 13.8:1 compression ratio.
• OEM alternative: Provides savings over OEM pricing.

Fitment:
2019 Yamaha YZ250F
2020 Yamaha WR250F
2020 Yamaha YZ250F
2020 Yamaha YZ250FX
2021 Yamaha WR250F
2021 Yamaha YZ250F
2021 Yamaha YZ250FX
2022 Yamaha WR250F
2022 Yamaha YZ250F
2022 Yamaha YZ250FX
2023 Yamaha WR250F
2023 Yamaha YZ250F
2023 Yamaha YZ250FX
2024 Yamaha WR250F
2024 Yamaha YZ250F
2024 Yamaha YZ250FX
2025 Yamaha WR250F
2025 Yamaha YZ250F
2025 Yamaha YZ250FX