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 - 95.00mm
Size A piston is 94.95mm
12.5:1 Compression Ratio
Made in Taiwan


Namura - Forged Top End Repair Kit Standard Bore - FX-40045K


  • 2003 Yamaha WR450F
  • 2003 Yamaha YZ450F
  • 2004 Yamaha WR450F
  • 2004 Yamaha YZ450F
  • 2005 Yamaha WR450F
  • 2005 Yamaha YZ450F
  • 2006 Yamaha WR450F

YZ450F 03-05 Namura - Top End Repair Kit Standard Bore - FX- 40045K

Excluding Sales Tax