{"product_id":"piston-kit-yamaha-yfm-660-grizzly-rhino-raptor-os-1-00","title":"OS 1.00 OEM Direct Fit Piston Kit For Yamaha YFM 660 Grizzly Rhino And Raptor 2002 To 2007","description":"\u003cdiv\u003e\n\u003cp\u003eOS 1.00 OEM Direct Fit Piston Kit for Yamaha YFM 660 Grizzly, Rhino, and Raptor models from 2002 through 2007 is a purpose-built engine component designed to restore factory compression and dependable power. This aftermarket replacement delivers a cost-effective path to peak performance without sacrificing the tolerances required for long-term reliability. Built to align with Yamaha specifications, it provides a direct-fit solution that helps your trail or farm work run smoother, cooler, and more reliably crank after crank.\u003c\/p\u003e\n\u003cp\u003eThe OS 1.00 piston kit offers a clear value proposition for riders facing typical wear on these engines—declining compression, oil consumption, and throttle response slowdowns from worn piston rings and lands. By delivering a properly sized, durable aluminum piston with precise ring fit, this aftermarket option helps restore consistent power and reliable sealing in dusty, heavy-use conditions common on trails and in fields, all while keeping operating costs down.\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\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\u003e2C6-11638-00-00, 3YF-11638-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Kit\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\u003eYamaha YFM 660 Grizzly, Rhino, and Raptor (2002–2007)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiston Size\u003c\/td\u003e\n\u003ctd\u003eOS 1.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size\u003c\/td\u003e\n\u003ctd\u003eSTD 100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eOEM \u0026amp; Aftermarket Cross-Reference Information\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eBrand \/ Type\u003c\/th\u003e\n\u003cth\u003eCross-Reference Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2C6-11638-00-00\u003c\/td\u003e\n\u003ctd\u003eYamaha OEM\u003c\/td\u003e\n\u003ctd\u003eDirect cross-reference for YFM660 piston kit OS 1.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3YF-11638-00-00\u003c\/td\u003e\n\u003ctd\u003eYamaha OEM\u003c\/td\u003e\n\u003ctd\u003eDirect cross-reference for YFM660 piston kit OS 1.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003eIncludes the essential top-end components needed to rebuild the piston area on Yamaha YFM 660 engines:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003ePiston\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003ePiston Rings\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eWrist Pin\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eCirclips\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ci\u003e*Gaskets and top-end seals are not included; use a separate top-end gasket kit for a complete rebuild.*\u003c\/i\u003e\u003c\/p\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 bolt into Yamaha YFM 660 Grizzly, Rhino, and Raptor models within the 2002–2007 window with minimal prep work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Aligns with Yamaha OEM references 2C6-11638-00-00 and 3YF-11638-00-00 for easy sourcing and matching parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials:\u003c\/b\u003e Aluminum alloy piston designed for strength, heat tolerance, and reliable ring seal under typical off-road conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEngine Reliability Restoration:\u003c\/b\u003e Restores compression and sealing, helping restore power delivery and reduce oil consumption in demanding trail or farm use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCost-Effective Replacement:\u003c\/b\u003e A budget-conscious option that preserves original performance without the premium OEM price tag.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration:\u003c\/b\u003e Reinstates factory-like throttle response and torque, enabling confident starts, climbs, and load handling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInspect the cylinder bore for scoring or out-of-round wear; hone or bore as necessary before installing the kit.\u003c\/li\u003e\n\u003cli\u003eVerify the bore diameter and OS size match the kit’s specifications; ensure no debris or burrs remain in the cylinder.\u003c\/li\u003e\n\u003cli\u003eLubricate the piston, rings, and wrist pin with assembly lubricant prior to assembly to prevent dry-start wear.\u003c\/li\u003e\n\u003cli\u003eInstall the wrist pin and circlips securely; confirm circlips are fully seated and not protruding into the crankcase.\u003c\/li\u003e\n\u003cli\u003eOrient piston rings correctly and stagger ring gaps to optimize sealing; verify ring end gaps per manual guidelines.\u003c\/li\u003e\n\u003cli\u003eFollow the engine service manual for proper torque specs and break-in procedures to avoid glazing or ring set failure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eRunning a worn piston dimension or degraded ring seal on the YFM 660 series leads to compression loss, reduced power, higher oil consumption, and potential overheating. Upgrading to this OS 1.00 piston kit restores proper compression and sealing, delivering dependable power and reliability for demanding trail work or farm duties.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319261143414,"sku":"190.40004-4","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_214600410.png?v=1772055968","url":"https:\/\/dgtagri.co.uk\/products\/piston-kit-yamaha-yfm-660-grizzly-rhino-raptor-os-1-00","provider":"DGT Agri","version":"1.0","type":"link"}