Yamaha YZ250F 250cc Stock Bore Complete Motor Rebuild Kit. Fits Yamaha YZ250F Dirt Bikes.Years 2003 & 2004 ONLY. Cylinder Works 77mm 250cc Stock Bore Nikasil Plated Cylinder. JE 13.5:1 Piston Kit (Includes, Piston, Pin, Rings & Clips) (Prefect For Pump Gas). Hotrods Heavy Duty Crankshaft & Connecting Rod. This is a bolt on kit with no machining required.
It will work with your stock head and valves.