Manufactured by Namura
Kit includes piston, rings, pin, clips, wrist pin bearing & top end gasket kit (you get exactly what is pictured)
Cast piston has super-high silicone content for additional strength
Piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life
Piston dome is anodized for superior heat resistance and longer lifespan
Namura gaskets use performance materials to increase durability and provide greater reliability
Includes all gaskets pictured to rebuild top end
Kit is for standard bore size - 54.00mm
Size B piston is 53.95mm
Compression ratio of 8.9:1
Made in Taiwan


Namura - Size B Top End Repair Kit Standard Bore - NX-40000-BK

Fits the following:

  • 1998 Yamaha YZ125
  • 1999 Yamaha YZ125
  • 2000 Yamaha YZ125

YZ125 98-00 Namura - Top End Repair Kit Standard Bore - NX- 40000-BK

Excluding Sales Tax