1998-2001 Yamaha YZ125 Dirt Bike Top End Engine Rebuild Kit [Bore Size (mm): 53.94 (Stock)]


(SAVE Now!)

as of 12/01/2023 (Details)

Namura Top End Engine Rebuild KitAll Namura Pistons have Molybdenium/Teflon Coatings that Minimize Resistance and Wear to Provide Extended LifeAnodized Domes That Provide Superior Heat Resistance and Extended Life SpanSuper-High Silicone Content for Additional StrengthPremium World Class Rings Produced by the Largest Japanese OEM Supplier in the WorldMOS(Teflon/Molybdenum) Coated SkirtsA rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizuresMachined Smooth HeadsReflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horse power and fuel economy by up to 6%Anodized DomesIncreases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistonsHypereutectic Casting ProcessProvides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures

Technical Details

  • Bore Size (mm): 53.94 (Stock)
  • 8.9:1 Compression - Ceramic Composite Cylinder
  • Namura Top End Repair Kits Include a Top End Gasket Set, Pistons, Rings, Wrist Pins, Circlips and Silver Coated SCM415 High Strength Chromoly Needle Bearings (Where Applicable)
  • Precision Cut Klingersil Coated Steel Head Gaskets for Better Sealing and High-Temperature Resistance
  • Compatibility: 1998-2000 Yamaha YZ125

Learn more