Athena 58mm Complete 144cc Big Bore Motor Rebuild Kit! This is the best and most reliable rebuild kit on the market! Fits Yamaha YZ125 2 Stroke Dirt Bikes. Years 1998 1999 2000 ONLY.
58mm 144cc Nikasil Athena Big Bore Cylinder. Athena 58mm Coated Piston Kit (Includes, Piston, Pin, Rings & Clips). Hotrods Heavy Duty Crank Shaft. Hotrods Heavy Duty Main Bearings. Bottom End Oil Seals Kit.
This is a bolt on kit.