![Athena Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F [S4F08100005B]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/1280x1280/products/123613/133540/C85D67F3-BC14-4B4C-BD5E-5F54D2438963__49334.1786980293.png?c=2 "Athena Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F [S4F08100005B]")
![Athena Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F [S4F08100005B]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/123613/133540/C85D67F3-BC14-4B4C-BD5E-5F54D2438963__49334.1786980293.png?c=2 "Athena Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F [S4F08100005B]")
Athena Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F [S4F08100005B]
Manufacturer Part Number: S4F08100005B
Parts Unlimited Part Number: 09104194
Product Type: Piston & Ring Kits
Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F
Details
- Piston Material: Forged 2618 Aluminum
- Product Name: Piston Kit
- Model: Racing
- Engine Type: 4-Stroke
- Style: Forged Big Bore
- Compression Ratio: 13.2:1
- Bore Size: 80.96 mm
- Units: Kit
- Riding Style: Off-Road
- Displacement: 250 cc
- Type: B
- High resistance to mechanical and thermal stresses
- Has been tested on engine dynamometer benches under progressive stress load, and thereafter on track to validate it performance even in the most extreme conditions
Verified Fitment
- 2016 Yamaha WR250F
- 2015 Yamaha WR250F
- 2017 Yamaha WR250F
- 2014 Yamaha YZ250F
- 2016 Yamaha YZ250F
- 2017 Yamaha YZ250F
- 2018 Yamaha YZ250F
- 2015 Yamaha YZ250F
Yes
![Athena Piston Kit - 80.95 mm - Yamaha WR250F/YZ250F [S4F08100005A]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/123612/133539/40D53083-1A11-4C6D-9473-08356AD9CA69__77478.1786980293.png?c=2 "Athena Piston Kit - 80.95 mm - Yamaha WR250F/YZ250F [S4F08100005A]")
![Wiseco Piston Kit - 77.00 mm - Yamaha YZ250F/FX | WR250F [RE812M07700]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/120798/130725/D0FAC147-7E54-4C17-8936-E61CFD89262F__35222.1786950267.png?c=2 "Wiseco Piston Kit - 77.00 mm - Yamaha YZ250F/FX | WR250F [RE812M07700]")
![Wiseco Piston Kit - 77.00 mm - Yamaha YZ250F/FX | WR250F [RE802M07700]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/120795/130722/0D9F2AD3-E8EB-439D-8BDF-857A440232BB__10542.1786950265.png?c=2 "Wiseco Piston Kit - 77.00 mm - Yamaha YZ250F/FX | WR250F [RE802M07700]")
![Athena Piston Kit - 97.95 mm - Yamaha [S4F09800004B]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/123607/133534/15F2F027-591A-4F1E-AD3E-7DFCBBF94952__66572.1786980288.png?c=2 "Athena Piston Kit - 97.95 mm - Yamaha [S4F09800004B]")
![Athena Piston Kit - 97.94 mm - Yamaha [S4F09800004A]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/123606/133533/D6F3B095-B55E-4E48-B58B-C5C49D5411D6__12526.1786980288.png?c=2 "Athena Piston Kit - 97.94 mm - Yamaha [S4F09800004A]")