This Yamaha YZ250 engine is remanufactured to ensure that it is in excellent condition and ready to use. With its high-quality build, it is sure to provide reliable and efficient performance for your dirtbike.  The Yamaha brand is well known for producing top-notch products, and this engine is no exception. It is designed to fit perfectly into your dirtbike and provide the power and performance you need. Whether you are a professional racer or a casual rider, this engine will meet all your needs. • OEM crank shaft rebuilt and trued to less than 0.001 thousands run out.  • Engine cases disassembled, bead blasted and cleaned.  • All new OEM transmission and crank bearings.  • All engine seals and gaskets replaced with OEM.  • New engine hardware kit.  • Transmission gears and drum fully inspected and tumbled.  • Replated CV-tech cylinder.  • Power valves lapped for smoother operation.  • Power valve return keeper mod done (prevents end from breaking).  • Timing set to factory 0.007 BTDC.  • 0.0018 piston to cylinder clearance.  • Squish at a factory 0.070 for pump fuel ( have available 0.050 ) race fuel head.  •New ART piston and rings.  • New EBC clutch plates and springs.  • V-force 3 reed valve system.  • Works connection magnetic drain and fill plug.                                                                             • New sun star front sprocket.  • Every nut and bolt torqued to specification.  • Warranty offered if correct fuel ratio and jetting is used for your application.  • Will drop in to 2001-2024 YZ 250 with no modifications. Shipping available at buyers expense.