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Namura Piston Assembly - 68mm Bore - NX-40026

  • Part #: 131734S
  • Manufacturer Part #: NX-40026

MSRP Price: $83.61

Our Price: $76.92

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$6.69 (8%)
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Overview of Namura Piston Assembly - 68mm Bore - NX-40026

  • High-performance Namura pistons are engineered in the USA, manufactured in Taiwan
  • High-silicon content Hypereutectic cast aluminum material for less heat expansion, tighter clearances, increased hardness, longer life and reduced scuffing
  • Features machined, smooth piston crowns for reduced carbon buildup, increased horsepower and fuel economy
  • Hard anodized crowns are 75% stronger than non-anodized, providing minimal expansion and reducing the chance of cold seizures when combined with Teflon/Molybdenum coated skirts
  • MOS2 (Teflon/Molybdenum) coated skirts perform at the highest standards, reducing friction and heat for added power and longevity
  • Namura rings match the OEM design except as noted
  • -B (.0004 in.) and -C (.0008 in.) fractional oversize pistons, available for some applications, extend the life of your expensive cylinder by renewing the original clearance if it's slightly worn, avoiding an expensive sleeve installation
  • Piston assemblies include ring(s), wrist pin and circlips


  • NOTE: Nikasil Bore; cylinder sleeving or replatling required for oversizes

Specs for Namura Piston Assembly - 68mm Bore - NX-40026

Bore Size 68 mm
Type Piston Assembly
Type - Pistons & Piston Rings Piston w/Ring Set
Units Each
Weight 0.80 lbs

Specs for Namura Piston Assembly - 68mm Bore - NX-40026

Bore Size 68 mm
Type Piston Assembly
Type - Pistons & Piston Rings Piston w/Ring Set
Units Each
Weight 0.80 lbs

Fitment for Namura Piston Assembly - 68mm Bore - NX-40026

See if this part fits your ride

Part 131734S fits the following machines

Yamaha
  • 1997 Yamaha WR250Z
  • 1996 Yamaha WR250Z
  • 1995 Yamaha WR250Z
  • 1994 Yamaha WR250Z
  • 1993 Yamaha WR250Z
  • 1992 Yamaha WR250Z
  • 1998 Yamaha YZ250
  • 1997 Yamaha YZ250
  • 1996 Yamaha YZ250
  • 1995 Yamaha YZ250
  • 1994 Yamaha YZ250
  • 1993 Yamaha YZ250
  • 1992 Yamaha YZ250
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Instructions and Manuals for Namura Piston Assembly - 68mm Bore - NX-40026