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

  • Part #:
    131683SB
  • Manufacturer Part #:
    NX-40025-B

MSRP Price: $88.95

Our Price: $80.06

You Save $8.89 (10%)
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Overview of 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

Included Items:
(1) 66.36mm Piston
(1) Ring set
(1) Wrist pin
(2) Circlips

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

Specs for Namura Piston Assembly - 66.41mm Bore - NX-40025-B

Bore Size 66.41 mm
Type Piston Assembly
Type Piston w/Ring Set
Units Each
Weight 0.70 lbs
Specs for Namura Piston Assembly - 66.41mm Bore - 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

Make Sure This Fits Your Ride
Yamaha
  • 2019 Yamaha YZ250
  • 2018 Yamaha YZ250
  • 2017 Yamaha YZ250
  • 2016 Yamaha YZ250
  • 2015 Yamaha YZ250
  • 2014 Yamaha YZ250
  • 2013 Yamaha YZ250
  • 2012 Yamaha YZ250
  • 2011 Yamaha YZ250
  • 2010 Yamaha YZ250
  • 2009 Yamaha YZ250
  • 2008 Yamaha YZ250
  • 2007 Yamaha YZ250
  • 2006 Yamaha YZ250
  • 2005 Yamaha YZ250
  • 2004 Yamaha YZ250
  • 2003 Yamaha YZ250
  • 2002 Yamaha YZ250
  • 2001 Yamaha YZ250
  • 2000 Yamaha YZ250
  • 1999 Yamaha YZ250
  • 2019 Yamaha YZ250X
  • 2018 Yamaha YZ250X
  • 2017 Yamaha YZ250X
  • 2016 Yamaha YZ250X
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Fits perfect every time
January 2, 2013
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Instructions and Manuals for Namura Piston Assembly - 66.41mm Bore - NX-40025-B