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Piston Assembly - 84mm Bore - NA-40005-4

  • Part #:
    1331924
  • Mfg Part #:
    NA-40005-4
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Piston Assembly - 84mm Bore - NA-40005-4

  • Part #:
    1331924
  • Mfg Part #:
    NA-40005-4
MSRP: $98.95

Price: $94.00 5% off!
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Namura Piston Assembly - 84mm Bore - NA-40005-4
  • 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


  • Included Items:
    (1) Pison
    (1) Ring set
    (2) Wrist pin clips
    (1) Wrist pin
Specifications
Part #: 1331924
Mfg #: NA-40005-4
Bore Size 84 mm
Type Piston Assembly
Type Piston w/Ring Set
Units Each
Weight 1.05 lbs
Fitment for Namura Piston Assembly - 84mm Bore - NA-40005-4

Part 1331924 fits the following machines

Yamaha
  • BW350 Big Wheel 1987-1988
  • YFM350 Raptor 2004
  • YFM350BA Bruin 2x4 2004-2006
  • YFM350ER Moto 4 1987-1990, 1992-1995
  • YFM350FA Bruin 4x4 2004-2006
  • YFM350FAH Bruin 4x4 Hunter Edition 2004-2006
  • YFM350FG Grizzly 4x4 2007-2014
  • YFM350FGH Grizzly 4x4 Hunter Edition 2008-2014
  • YFM350FGI Grizzly 4x4 IRS 2007-2011
  • YFM350FGIH Grizzly 4x4 IRS Hunter Edition 2007-2011
  • YFM350FH Big Bear 4x4 Hunter Edition 1999
  • YFM350FW Big Bear 4x4 1987-1996
  • YFM350FW Big Bear 4x4 SE 1997
  • YFM350FWB Big Bear 4x4 1997-1999
  • YFM350FX Wolverine 4x4 1995-2005
  • YFM350G Grizzly 2007-2011
  • YFM350R Raptor 2005-2013
  • YFM350RSE Raptor Special Edition 2005-2007
  • YFM350RSE2 Raptor Special Edition 2 2007
  • YFM350U Big Bear 2x4 1996-1999
  • YFM350X Warrior 1987-2004
  • YFM350X Wolverine 2x4 2006-2009

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Piston
It was the wrong piston size for my bike ...but it was my fault so I call and got it straight and my new pistons is on its way...
March 14, 2018
Purchased
over 2 years ago