🛠️ Yamaha YZ250 Top End Rebuild Kit – Wiseco Piston + Cylinder + Cometic Gaskets (1999–2024)

Restore factory power to your YZ250 with this complete top end rebuild kit. Designed for serious 2-stroke riders, this package delivers increased compression, horsepower, and reliability with premium aftermarket parts—including a Wiseco forged piston and Cometic gasket kit.

✅ What’s Included:

• Stock bore 66.4mm Nikasil-plated cylinder (OEM-style, 1-year warranty)

• Wiseco forged piston w/ rings, wristpin & circlips

• Cometic gasket kit – top end

• NGK spark plug – included for instant ignition performance

📦 Fitment:

• Fits all Yamaha YZ250 two-stroke dirt bikes from 1999–2024, including special editions:

  • 2024 YZ250 50th Anniversary Edition

  • 2023–2022 Monster Energy Editions

  • 2014–2013 Team Yamaha Editions

  • Compatible with all standard YZ250 trims across the entire generation

🛡️ Warranty Info:

1-year warranty on the Nikasil-plated cylinder. Wiseco piston and Cometic gaskets must be installed by a qualified mechanic for optimal performance and durability. No warranty on improper installation or tuning.