{"product_id":"namura-na-40019k-49-00-mm-standard-11-1-top-end-kit-for-yamaha-yfm125g-grizzly","title":"Namura NA-40019K 49.00 mm Standard 11:1 Top End Kit for Yamaha YFM125G Grizzly","description":"\u003cp\u003eRestore dependable engine performance with the Namura NA-40019K Top End Kit, designed for 2004–2013 Yamaha YFM125G Grizzly models with SRA suspension. This 49.00 mm standard-bore kit features an 11:1 compression ratio and includes the essential components needed for a complete top-end rebuild: piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit.\u003c\/p\u003e\u003cp\u003eThe Namura piston uses a MOS2 coating made from Teflon and molybdenum. Its rolled-on application creates a durable bond designed to help improve heat transfer, reduce friction, and minimize the risk of cold seizures. The machined smooth head helps reflect combustion heat and limit carbon buildup, supporting piston protection and consistent engine operation.\u003c\/p\u003e\u003cp\u003eFor added durability, the piston dome is anodized to improve heat resistance and strength. The hypereutectic casting process increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. These features make the NA-40019K a practical replacement solution for maintaining reliable performance in compatible Yamaha utility ATV engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e Fits 2004–2013 Yamaha YFM125G Grizzly models with SRA suspension. Verify the model year, engine configuration, and standard-bore specification before installation. Manufacturer part number: NA-40019K. Vendor part number: 186-4019.\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\u003e49.00 mm standard-bore piston with an 11:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eMOS2 Teflon and molybdenum coated skirt helps reduce friction, improve heat transfer, and minimize cold-seizure risk\u003c\/li\u003e\n\u003cli\u003eMachined smooth piston head helps reflect combustion heat and reduce carbon buildup\u003c\/li\u003e\n\u003cli\u003eAnodized piston dome improves heat resistance and durability\u003c\/li\u003e\n\u003cli\u003eHypereutectic casting process provides controlled expansion, enhanced wear resistance, and improved high-temperature performance\u003c\/li\u003e\n\u003cli\u003eFits 2004–2013 Yamaha YFM125G Grizzly models with SRA suspension\u003c\/li\u003e\n\u003cli\u003eBrand: Namura; manufacturer part number: NA-40019K; vendor part number: 186-4019\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1989 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1990 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1991 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1992 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1993 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1994 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1995 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1996 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1997 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1998 Yamaha YFA1 Breeze 125\u003cbr\u003e\n1999 Yamaha YFA1 Breeze 125\u003cbr\u003e\n2000 Yamaha YFA1 Breeze 125\u003cbr\u003e\n2001 Yamaha YFA1 Breeze 125\u003cbr\u003e\n2002 Yamaha YFA1 Breeze 125\u003cbr\u003e\n2003 Yamaha YFA1 Breeze 125\u003cbr\u003e\n2004 Yamaha YFA1 Breeze 125\u003cbr\u003e\n2004 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2005 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2006 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2007 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2008 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2009 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2010 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2011 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2012 Yamaha YFM125G Grizzly [SRA]\u003cbr\u003e\n2013 Yamaha YFM125G Grizzly [SRA]","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67558973505771,"sku":"186-4019","price":104.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/adcb-5e94e09116821.jpg?v=1790769448","url":"https:\/\/ctracingservices.com\/products\/namura-na-40019k-49-00-mm-standard-11-1-top-end-kit-for-yamaha-yfm125g-grizzly","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}