50 Caliber Racing top end rebuild kit for your Yamaha YFM250 Moto-4, Bear Tracker and Timberwolf ATV. Our kits are high quality, complete and ready to build right out of the box. You'll be able to take confidence that you'll have the precision components you need to get your toys running again, the right way.
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50 Caliber Racing Top End Cylinder Kit Yamaha Moto-4 YFM 250
50 Caliber Racing stock replacement kit. Includes all gaskets and components necessary to rebuild your top end. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. Nothing will beat the look on your kid's face when you bring their bike back from the dead!
Kit Includes:
- 1 Cylinder
- 1 Piston
- 1 Piston Ring Kit
- 2 Circlips
- 1 Wrist Pin
- 1 Head Gasket
- 1 Base Gasket
Replaces Yamaha part # 4BD-11310-01-00
Fits the following Yamaha models:
- Moto-4 & Tri-Moto 225 (83-88) *will increase displacement to 250cc
- Moto-4 250 (89-91)
- Bear Tracker (99-04)
- Timberwolf (92-00)