Yamaha YZ125 58mm 144cc Athena Big Bore Kit – Top End Rebuild (1997–2004)

Yamaha YZ125 58mm 144cc Athena Big Bore Kit – Top End Rebuild (1997–2004)

Regular price$923.00
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Upgrade your YZ125 into a 144cc powerhouse with the best-performing and most reliable big bore kit on the market. This Athena kit includes everything you need for a full top-end rebuild—engineered for more power and factory-level reliability.


✅ What’s Included:

  • Athena 58mm Nikasil Big Bore Cylinder (144cc)

  • Athena Coated Piston Kit (Piston, rings, wrist pin, and circlips)

  • Athena Complete Top End Gasket Set

  • Athena Cylinder Head

  • Athena Head Stud Kit

  • Athena Power Valves

All components are brand new and covered by Athena’s warranty.


📦 Fitment:

Fits Yamaha YZ125 (2-stroke) models:

  • 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004


🛡️ Warranty Info:

  • Manufacturer warranty included

  • Installation by a qualified technician is required

  • Warranty does not cover misuse, improper tuning, or incorrect break-in procedures

We ship next day most of the time. Modquad parts are shipped Monday-Thursday. Engine Kits are 3-5 business days.

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