Athena Big Bore Cylinder Kit 5.6 mm Oversize to 72 mm - 300cc - P400485100042 | Yamaha YZ250 2003-2023

Features:

• Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets
• Includes Forged piston, rings, clips and pin
• Athena top-end gasket set includes required seals and hardware
• Easy-to-follow step-by-step installation instructions
• Most are bolt-on; no machining required except where noted
• Rear Wheel Power 45.3 HP / 7600 rpm