{"product_id":"namura-na-40005-2k-top-end-kit-83-45-mm-0-50-mm-11-1-compression-for-yamaha-wolverine-and-grizzly-350","title":"Namura NA-40005-2K Top End Kit 83.45 mm, +0.50 mm, 11:1 Compression for Yamaha Wolverine and Grizzly 350","description":"\u003cp\u003eThe Namura NA-40005-2K Top End Kit is designed for rebuilding the top end of select Yamaha 350 ATV engines. This 11:1 compression kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a comprehensive installation. It is sized at 83.45 mm with a +0.50 mm oversize configuration and is intended for compatible applications using the original engine specifications and required cylinder preparation.\u003c\/p\u003e\u003cp\u003eDesigned for dependable performance and durability, the piston uses a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. The MOS2, or Teflon\/molybdenum, coated skirts use a rolled-on application process for a strong bond that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while anodized domes improve heat resistance and piston durability.\u003c\/p\u003e\u003cp\u003eFitment includes 2006–2009 Yamaha YFM350X Wolverine 2WD [SRA] models and 2007–2012 Yamaha YFM350FG Grizzly 4WD [SRA] models. Confirm the model year, engine configuration, bore requirement, and cylinder condition before installation. Manufacturer part number: NA-40005-2K. Vendor part number: 186-40052.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eComplete Top End Kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit.\u003c\/li\u003e\n\u003cli\u003e83.45 mm Bore Size: +0.50 mm oversize configuration for compatible Yamaha 350 engine rebuilds.\u003c\/li\u003e\n\u003cli\u003e11:1 Compression Ratio: Supports the specified performance configuration for compatible applications.\u003c\/li\u003e\n\u003cli\u003eMOS2-Coated Skirts: Teflon and molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk.\u003c\/li\u003e\n\u003cli\u003eMachined Smooth Head: Helps reflect combustion heat and reduce carbon buildup on the piston.\u003c\/li\u003e\n\u003cli\u003eAnodized Dome: Improves heat resistance and durability compared with non-anodized piston domes.\u003c\/li\u003e\n\u003cli\u003eHypereutectic Casting: Higher silicon content helps reduce expansion, increase wear resistance, and tolerate higher cylinder temperatures.\u003c\/li\u003e\n\u003cli\u003eFitment: Fits 2006–2009 Yamaha YFM350X Wolverine 2WD [SRA] and 2007–2012 Yamaha YFM350FG Grizzly 4WD [SRA] models.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1987 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1987 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1987 Yamaha YFM350X Warrior\u003cbr\u003e\n1988 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1988 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1988 Yamaha YFM350X Warrior\u003cbr\u003e\n1989 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1989 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1989 Yamaha YFM350X Warrior\u003cbr\u003e\n1990 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1990 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1990 Yamaha YFM350X Warrior\u003cbr\u003e\n1991 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1991 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1991 Yamaha YFM350X Warrior\u003cbr\u003e\n1992 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1992 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1992 Yamaha YFM350X Warrior\u003cbr\u003e\n1993 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1993 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1993 Yamaha YFM350X Warrior\u003cbr\u003e\n1994 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1994 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1994 Yamaha YFM350X Warrior\u003cbr\u003e\n1995 Yamaha YFM350ER Moto-4\u003cbr\u003e\n1995 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1995 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n1995 Yamaha YFM350X Warrior\u003cbr\u003e\n1996 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1996 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n1996 Yamaha YFM350U Big Bear 2WD [SRA]\u003cbr\u003e\n1996 Yamaha YFM350X Warrior\u003cbr\u003e\n1997 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1997 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n1997 Yamaha YFM350U Big Bear 2WD [SRA]\u003cbr\u003e\n1997 Yamaha YFM350X Warrior\u003cbr\u003e\n1998 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1998 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n1998 Yamaha YFM350U Big Bear 2WD [SRA]\u003cbr\u003e\n1998 Yamaha YFM350X Warrior\u003cbr\u003e\n1999 Yamaha YFM350FW Big Bear 4WD [SRA]\u003cbr\u003e\n1999 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n1999 Yamaha YFM350U Big Bear 2WD [SRA]\u003cbr\u003e\n1999 Yamaha YFM350X Warrior\u003cbr\u003e\n2000 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n2000 Yamaha YFM350X Warrior\u003cbr\u003e\n2001 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n2001 Yamaha YFM350X Warrior\u003cbr\u003e\n2002 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n2002 Yamaha YFM350X Warrior\u003cbr\u003e\n2003 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n2003 Yamaha YFM350X Warrior\u003cbr\u003e\n2004 Yamaha YFM350BA Bruin 2WD [SRA]\u003cbr\u003e\n2004 Yamaha YFM350FA Bruin 4WD [SRA]\u003cbr\u003e\n2004 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n2004 Yamaha YFM350R Raptor\u003cbr\u003e\n2004 Yamaha YFM350X Warrior\u003cbr\u003e\n2005 Yamaha YFM350BA Bruin 2WD [SRA]\u003cbr\u003e\n2005 Yamaha YFM350FA Bruin 4WD [SRA]\u003cbr\u003e\n2005 Yamaha YFM350FX Wolverine 4WD [SRA]\u003cbr\u003e\n2005 Yamaha YFM350R Raptor\u003cbr\u003e\n2006 Yamaha YFM350BA Bruin 2WD [SRA]\u003cbr\u003e\n2006 Yamaha YFM350FA Bruin 4WD [SRA]\u003cbr\u003e\n2006 Yamaha YFM350R Raptor\u003cbr\u003e\n2006 Yamaha YFM350X Wolverine 2WD [SRA]\u003cbr\u003e\n2007 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2007 Yamaha YFM350FGI Grizzly 4WD [IRS]\u003cbr\u003e\n2007 Yamaha YFM350G Grizzly 2WD [SRA]\u003cbr\u003e\n2007 Yamaha YFM350R Raptor\u003cbr\u003e\n2007 Yamaha YFM350X Wolverine 2WD [SRA]\u003cbr\u003e\n2008 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2008 Yamaha YFM350FGI Grizzly 4WD [IRS]\u003cbr\u003e\n2008 Yamaha YFM350G Grizzly 2WD [SRA]\u003cbr\u003e\n2008 Yamaha YFM350R Raptor\u003cbr\u003e\n2008 Yamaha YFM350X Wolverine 2WD [SRA]\u003cbr\u003e\n2009 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2009 Yamaha YFM350FGI Grizzly 4WD [IRS]\u003cbr\u003e\n2009 Yamaha YFM350G Grizzly 2WD [SRA]\u003cbr\u003e\n2009 Yamaha YFM350R Raptor\u003cbr\u003e\n2009 Yamaha YFM350X Wolverine 2WD [SRA]\u003cbr\u003e\n2010 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2010 Yamaha YFM350FGI Grizzly 4WD [IRS]\u003cbr\u003e\n2010 Yamaha YFM350G Grizzly 2WD [SRA]\u003cbr\u003e\n2010 Yamaha YFM350R Raptor\u003cbr\u003e\n2011 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2011 Yamaha YFM350FGI Grizzly 4WD [IRS]\u003cbr\u003e\n2011 Yamaha YFM350G Grizzly 2WD [SRA]\u003cbr\u003e\n2011 Yamaha YFM350R Raptor\u003cbr\u003e\n2012 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2012 Yamaha YFM350FGI Grizzly 4WD [IRS]\u003cbr\u003e\n2012 Yamaha YFM350G Grizzly 2WD [SRA]\u003cbr\u003e\n2012 Yamaha YFM350R Raptor\u003cbr\u003e\n2013 Yamaha YFM350FG Grizzly 4WD [SRA]\u003cbr\u003e\n2013 Yamaha YFM350R Raptor\u003cbr\u003e\n2014 Yamaha YFM350FG Grizzly 4WD [SRA]","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67559048052971,"sku":"186-40052","price":127.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/dd77-572a583cd9540_08378ffc-c7b6-4bab-b0e9-29d444922329.jpg?v=1790769922","url":"https:\/\/ctracingservices.com\/products\/namura-na-40005-2k-top-end-kit-83-45-mm-0-50-mm-11-1-compression-for-yamaha-wolverine-and-grizzly-350","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}