{"product_id":"piston-kit-yamaha-yfm-660-grizzly-rhino-raptor-os-0-50","title":"Piston Kit OS 0.50 For Yamaha YFM 660 Grizzly Rhino Raptor 2002 To 2007 OEM Replacement","description":"\u003cdiv\u003e\n\u003cp\u003eEngineered to meet or exceed Yamaha’s performance benchmarks, this OS 0.50 oversize piston kit restores compression and sustained power for Yamaha YFM 660 Grizzly, Rhino, and Raptor models manufactured from 2002 through 2007. The kit is designed to drop into the stock bore with tight, precision tolerances, delivering reliable top-end sealing and improved throttle response. It’s an ideal choice when you’re chasing lost compression from worn rings, bore wear, or consistent power fade after years of trail and farm use.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket replacement is precision-machined to restore peak performance in demanding riding conditions. The OS oversize approach helps reclaim lost compression by compensating for bore wear, reducing blow-by, and reestablishing power for difficult climbs, heavy loads, and long days on rough terrain. For trail riders and farm work alike, it offers a dependable, bolt-in solution that revives engine efficiency without resorting to a full engine rebuild.\u003c\/p\u003e\n\u003ch3\u003eComprehensive Vehicle Fitment\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003cth\u003eModels \/ Series\u003c\/th\u003e\n\u003cth\u003eYears \/ Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM 660 Grizzly\u003c\/td\u003e\n\u003ctd\u003e2002–2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM 660 Rhino\u003c\/td\u003e\n\u003ctd\u003e2002–2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM 660 Raptor\u003c\/td\u003e\n\u003ctd\u003e2002–2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAttribute\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Reference Part Numbers\u003c\/td\u003e\n\u003ctd\u003e2C6-11636-00-00, 3YF-11636-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Kit OS 0.50 oversize\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eCylinder\/piston kit for Yamaha YFM 660 Grizzly, Rhino, and Raptor (2002–2007)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiston Material\u003c\/td\u003e\n\u003ctd\u003eForged aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size \/ Oversize\u003c\/td\u003e\n\u003ctd\u003e100.50 mm \/ Oversize +0.50 mm (OS 0.50)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStroke\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplacement\u003c\/td\u003e\n\u003ctd\u003e686 cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eOEM \u0026amp; Aftermarket Cross-Reference Information\u003c\/h3\u003e\n\u003ctable style=\"width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 22.3827%;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"width: 19.6461%;\"\u003eBrand \/ Type\u003c\/th\u003e\n\u003cth style=\"width: 57.2492%;\"\u003eCross-Reference Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 22.3827%;\"\u003e2C6-11636-00-00\u003c\/td\u003e\n\u003ctd style=\"width: 19.6461%;\"\u003eOEM\u003c\/td\u003e\n\u003ctd style=\"width: 57.2492%;\"\u003eCross-reference to aftermarket OS 0.50 piston kit; fits Yamaha YFM 660 Grizzly\/Rhino\/Raptor (2002–2007)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 22.3827%;\"\u003e3YF-11636-00-00\u003c\/td\u003e\n\u003ctd style=\"width: 19.6461%;\"\u003eOEM\u003c\/td\u003e\n\u003ctd style=\"width: 57.2492%;\"\u003eCross-reference to aftermarket OS 0.50 piston kit; fits Yamaha YFM 660 Grizzly\/Rhino\/Raptor (2002–2007)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cp\u003eThis piston kit comes complete with the essential top-end components you need for a proper refresh.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003ePiston\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eRings\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eWrist Pin\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003ePiston Circlips\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cem\u003eNote: Gaskets, head gasket, base gaskets, and other related components are not included.\u003c\/em\u003e\n\u003ch3\u003eWhy Choose This Aftermarket Replacement?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDirect-Fit Compatibility\u003c\/b\u003e – engineered to drop into the stock bore without extensive machining, restoring factory-like performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference\u003c\/b\u003e – aligns with Yamaha OEM standards for 2C6-11636-00-00 and 3YF-11636-00-00, ensuring reliable interchangeability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials\u003c\/b\u003e – forged aluminum piston delivers strength-to-weight advantages and better heat tolerance for demanding trail and work sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAccurate Oversize Return\u003c\/b\u003e – OS 0.50 oversize compensates for bore wear, reclaiming compression and steady power delivery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComplete Top-End Kit\u003c\/b\u003e – includes rings, wrist pin, and circlips for a straightforward installation and a smooth break-in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration\u003c\/b\u003e – aimed at reviving lost power and responsiveness after long-term use in rugged conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify bore size before installation and confirm you need OS 0.50 oversize; re-bore if the cylinder shows excessive wear beyond tolerance.\u003c\/li\u003e\n\u003cli\u003eThoroughly clean the cylinder, honing deposits and scoring before installing rings and the piston; inspect ring grooves for wear.\u003c\/li\u003e\n\u003cli\u003eLubricate the piston, rings, and wrist pin with assembly lube or clean engine oil during assembly to prevent dry startup.\u003c\/li\u003e\n\u003cli\u003eInstall rings in the correct orientation and stagger ring gaps to minimize blow-by; use a proper ring compressor for even seating.\u003c\/li\u003e\n\u003cli\u003eInsert the wrist pin and secure with circlips, ensuring clips are fully seated and not protruding into the oil passage.\u003c\/li\u003e\n\u003cli\u003eFollow the engine’s service manual for any related gasket replacements and final torque checks on adjacent fasteners; avoid over-tightening bearings or fasteners around the cylinder head.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eRunning a worn top end on a Yamaha 660 can lead to progressively worse compression, oil consumption, and power loss, especially under load in demanding terrain. This replacement restores reliable compression and consistent power, reducing the risk of piston seizure and unplanned downtime so you can tackle trails or chores with confidence. \u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319261045110,"sku":"190.40004-2","price":92.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/image_2026-02-25_214906615.png?v=1774886191","url":"https:\/\/dgtagri.co.uk\/products\/piston-kit-yamaha-yfm-660-grizzly-rhino-raptor-os-0-50","provider":"DGT Agri","version":"1.0","type":"link"}