{"product_id":"namura-na-40004-2-100-47-mm-0-50-mm-9-2-1-piston-kit-for-yamaha-grizzly-660-and-rhino-660","title":"NAMURA NA-40004-2 100.47 mm (+0.50 mm) 9.2:1 Piston Kit for Yamaha Grizzly 660 and Rhino 660","description":"Will not accept OEM rings and rings will not work on OEM piston\n\u003cp\u003eThe NAMURA NA-40004-2 Piston Kit is designed for select Yamaha 660cc off-road applications and features a 100.47 mm piston diameter with a +0.50 mm oversize specification and a 9.2:1 compression ratio. This replacement piston kit supports engine rebuilding and restoration when the cylinder has been professionally bored and honed to match the piston size.\u003c\/p\u003e\u003cp\u003eFitment includes 2002–2008 Yamaha YFM660FG Grizzly 4WD [IRS] models and 2004–2006 Yamaha YXR660F Rhino 660 models. Verify the vehicle model, year, engine configuration, and required bore size before ordering to ensure proper application. The manufacturer part number is NA-40004-2, and the vendor part number is 187-400042.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This NAMURA piston kit will not accept OEM piston rings, and the included or compatible replacement rings will not work with an OEM piston. Use the correct matching piston and ring set together, and follow the manufacturer’s clearance, installation, and break-in specifications. Professional installation is recommended for accurate cylinder preparation and reliable engine performance.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSize: 100.47 mm piston diameter with +0.50 mm oversize specification\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 9.2:1\u003c\/li\u003e\n\u003cli\u003eApplication: Replacement piston kit for select Yamaha 660cc ATV and utility vehicle engines\u003c\/li\u003e\n\u003cli\u003eFitment: 2002–2008 Yamaha YFM660FG Grizzly 4WD [IRS]\u003c\/li\u003e\n\u003cli\u003eFitment: 2004–2006 Yamaha YXR660F Rhino 660\u003c\/li\u003e\n\u003cli\u003eBrand: NAMURA\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: NA-40004-2\u003c\/li\u003e\n\u003cli\u003eVendor Part Number: 187-400042\u003c\/li\u003e\n\u003cli\u003eCompatibility: Will not accept OEM rings, and the matching replacement rings will not work on an OEM piston\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2001 Yamaha YFM660R Raptor\u003cbr\u003e\n2002 Yamaha YFM660FG Grizzly 4WD [IRS]\u003cbr\u003e\n2002 Yamaha YFM660R Raptor\u003cbr\u003e\n2003 Yamaha YFM660FG Grizzly 4WD [IRS]\u003cbr\u003e\n2003 Yamaha YFM660R Raptor\u003cbr\u003e\n2004 Yamaha YFM660FG Grizzly 4WD [IRS]\u003cbr\u003e\n2004 Yamaha YFM660R Raptor\u003cbr\u003e\n2004 Yamaha YXR660F Rhino 660\u003cbr\u003e\n2005 Yamaha YFM660FG Grizzly 4WD [IRS]\u003cbr\u003e\n2005 Yamaha YFM660R Raptor\u003cbr\u003e\n2005 Yamaha YXR660F Rhino 660\u003cbr\u003e\n2006 Yamaha YFM660FG Grizzly 4WD [IRS]\u003cbr\u003e\n2006 Yamaha YXR660F Rhino 660\u003cbr\u003e\n2007 Yamaha YFM660FG Grizzly 4WD [IRS]\u003cbr\u003e\n2007 Yamaha YXR660F Rhino 660\u003cbr\u003e\n2008 Yamaha YFM660FG Grizzly 4WD [IRS]","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67557912576235,"sku":"187-400042","price":116.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/cfff-5e99dee8b86a6_a9602378-f098-45f0-9472-81973fdacc2b.jpg?v=1790755795","url":"https:\/\/ctracingservices.com\/products\/namura-na-40004-2-100-47-mm-0-50-mm-9-2-1-piston-kit-for-yamaha-grizzly-660-and-rhino-660","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}