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Piston Assembly - 66.41mm Bore - NX-40025-B

  • Part #:
    131683SB
  • Mfg Part #:
    NX-40025-B
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Piston Assembly - 66.41mm Bore - NX-40025-B

  • Part #:
    131683SB
  • Mfg Part #:
    NX-40025-B
MSRP: $88.95

Price: $71.16 20% off!
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In Stock - 2 on Hand

Namura Piston Assembly - 66.41mm Bore - NX-40025-B
  • 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

NOTE: Ceramic composite cylinder; cylinder sleeving or replating required for oversizes



Included Items:

(1) Piston
(1) Ring set
(1) Wrist pin
(2) Circlips

Specifications
Part #: 131683SB
Mfg #: NX-40025-B
Bore Size 66.41 mm
Type Piston Assembly
Type Piston w/Ring Set
Units Each
Weight 0.70 lbs
Fitment for Namura Piston Assembly - 66.41mm Bore - NX-40025-B

Part 131683SB fits the following machines

Yamaha
  • YZ250 1999-2020
  • YZ250X 2016-2020
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Top end
Fits perfect every time
January 2, 2013