19-23 Yamaha YZ250F YZ 250F 85mm 300cc Big Bore ATHENA Piston Cylinder Rebuild

  
Athena 85mm 300cc Big Bore Cylinder Top End Kit Forged Piston Kit! This is the best and most reliable rebuild kit on the market! Fits Yamaha YZ250F Dirt Bikes.

Years 2019 2020 2021 2022 2023 ONLY. Fits Yamaha YZ250FX Dirt Bikes. Years 2020 2021 2022 2023 ONLY. Fits Yamaha WR250F Dirt Bikes. Athena Nikasil 85mm 300cc Big Bore Cylinder.

Larger Water Jackets For Better Cooling! Athena Forged & Coated Piston Kit (Includes, Piston, Pin, Rings & Clips). 13.3:1 Compression Piston. Athena Complete Top End Gasket Set With MLS Head Gasket.

It will work with your stock head and valves.