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Namura Piston Assembly - 54mm Bore - NX-40001

  • Part #: 131681S
  • Manufacturer Part #: NX-40001

MSRP Price: $76.95

Our Price: $69.26

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$7.69 (10%)
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Overview of Namura Piston Assembly - 54mm Bore - NX-40001

  • 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: Ceramic composite cylinder; cylinder sleeving or replating required for oversize

Specs for Namura Piston Assembly - 54mm Bore - NX-40001

Bore Size 54 mm
Type Piston Assembly
Type - Pistons & Piston Rings Piston w/Ring Set
Units Each
Weight 0.45 lbs

Specs for Namura Piston Assembly - 54mm Bore - NX-40001

Bore Size 54 mm
Type Piston Assembly
Type - Pistons & Piston Rings Piston w/Ring Set
Units Each
Weight 0.45 lbs

Fitment for Namura Piston Assembly - 54mm Bore - NX-40001

See if this part fits your ride

Part 131681S fits the following machines

Yamaha
  • 2004 Yamaha YZ125
  • 2003 Yamaha YZ125
  • 2002 Yamaha YZ125
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Instructions and Manuals for Namura Piston Assembly - 54mm Bore - NX-40001