Manufactured by Namura
Namura FORGED Series piston
Kit includes Piston, Rings, Top End Gasket Kit, Pin, & Clips (you get exactly what is pictured)
Unique Features: Namura Forged Pistons offer dyno-proven gains in performance and durability over industry standard 4032 forged pistons. Namura's exclusive forged alloy used offers lower expansion rates, allowing for tighter build tolerances and superior tensile strength at operating temperatures.
All Namura Forged pistons come with Namura's signature features: 100% CNC-machine piston domes, hard anodized domes for reduced carbon build-up and heat resistance and M0S2 coated skirts for excellent break-in protection and properties.
Includes all gaskets pictured to rebuild top end
Kit is for standard bore size - 77.00mm
Size A piston is 76.96mm
Made in Taiwan


Namura - Forged Top End Repair Kit Standard Bore - FX-40037K


  • 2014 Yamaha YZ250F
  • 2015 Yamaha WR250F
  • 2015 Yamaha YZ250F
  • 2015 Yamaha YZ250FX
  • 2016 Yamaha WR250F
  • 2016 Yamaha YZ250F
  • 2016 Yamaha YZ250FX
  • 2017 Yamaha WR250F
  • 2017 Yamaha YZ250F
  • 2017 Yamaha YZ250FX
  • 2018 Yamaha WR250F
  • 2018 Yamaha YZ250F
  • 2018 Yamaha YZ250FX
  • 2019 Yamaha YZ250FX

YZ250F 14-18 Namura - Top End Repair Kit Standard Bore - FX- 40037K

Excluding Sales Tax