Athena Big Bore Cylinder Kit 4.0 mm Oversize to 58 mm - 144cc - P400485100030 | Yamaha YZ125 2005-2020

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
• Race cylinder kits include a nickel carbide coated cylinder ported to Factory
• Works specs, special hard anodized exhaust valves, complete piston kit and a top end gasket set
• Factory cylinder kits include all parts in the Race kits plus an aluminum cylinder head with removable brass dome allowing for higher compression and antidetonating features
• REAR WHEEL HORSE POWER: 37.6 HP / 11.200 RPM