{"product_id":"piston-ring-kit-yamaha-yfm-350-yfm-400-f-fw-fb-std-1987-2011","title":"Piston Ring Kit STD Bore Fits Yamaha YFM 350 And YFM 400 ATV Models 1987 2011 FW FB","description":"\u003cp\u003eThis piston ring kit is engineered for Yamaha YFM350 and YFM400 ATV engines spanning 1987 through 2011, delivering a precise STD bore restoration that revives compression and oil containment. Designed to fit a broad lineup—including Big Bear, Grizzly, and Warrior variants—this kit returns the engine to factory-like sealing and power without the higher cost of OEM parts. When installed with proper break-in and routine maintenance, it helps reduce oil consumption and sustain reliable performance on trails or in field work.\u003c\/p\u003e\n\u003cp\u003eBuilt to withstand rugged daily use, this aftermarket STD bore set targets common wear patterns: worn or glazing rings, diminishing compression, and oil blow-by. It provides a dependable, cost-effective alternative to factory parts while preserving OEM-style fit and function for long-lasting reliability in harsh trail conditions and demanding farm tasks.\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\u003eYFM350ER\u003c\/td\u003e\n\u003ctd\u003e1987–2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350U\u003c\/td\u003e\n\u003ctd\u003e1987–2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350F\u003c\/td\u003e\n\u003ctd\u003e1987–1999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350FW\u003c\/td\u003e\n\u003ctd\u003e1987–1999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350FX\u003c\/td\u003e\n\u003ctd\u003e1987–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350X\u003c\/td\u003e\n\u003ctd\u003e1987–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350G\u003c\/td\u003e\n\u003ctd\u003e2007–2010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM350R\u003c\/td\u003e\n\u003ctd\u003e2004–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM400F\u003c\/td\u003e\n\u003ctd\u003e1993–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM400FW\u003c\/td\u003e\n\u003ctd\u003e1993–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM400FB\u003c\/td\u003e\n\u003ctd\u003e2007–2011\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\u003e4GB-11610-00-00 (OEM); Superseded OEMs include 42Y-11610-000, 42Y-11610-010, 4X71-1610-000, 4X71-1610-010, 4X71-1610-020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Ring Kit, Standard Bore (STD)\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 YFM350 and YFM400 series ATVs, 1987–2011 (models listed in fitment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size\u003c\/td\u003e\n\u003ctd\u003eStandard bore (0.00 oversize)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Rings\u003c\/td\u003e\n\u003ctd\u003eTypically includes 3 rings per cylinder: Top compression ring, Second compression ring, Oil ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial \/ Finish\u003c\/td\u003e\n\u003ctd\u003eStandard piston-ring alloy; top ring chromed or plated per OEM spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRing Arrangement Notes\u003c\/td\u003e\n\u003ctd\u003e3-ring set designed to replicate OEM geometry and sealing characteristics; rings are sized to Yamaha factory tolerances when used with the corresponding STD bore cylinder\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\u003e4GB-11610-00-00\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eOEM Yamaha piston ring set; cross-references to superseded OEMs: 42Y116100000, 42Y116100100, 4X7116100000, 4X7116100100, 4X7116100200\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\u003eThis box contains the standard Yamaha YFM350\/400 piston ring set (STD bore) ready for installation on the cylinder. In general, you can expect:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003eTop compression ring\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eSecond compression ring\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eOil ring\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNot included: piston, gaskets, circlips, or other ancillary components.\u003c\/em\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 Precisely matched to Yamaha YFM350\/400 engines listed in the fitment table to restore OEM-like sealing and performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Clear cross-references to superseded Yamaha OEM part numbers to ease parts sourcing and compatibility checks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials:\u003c\/b\u003e Standard alloy piston rings with chrome\/plated surfaces where required to mirror factory performance and longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eExact Bore Match:\u003c\/b\u003e STD bore specification designed to restore proper compression without requiring oversized machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCost-Effective Reliability:\u003c\/b\u003e A durable option that delivers OEM-style function at a fraction of OEM pricing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSealing \u0026amp; Break-In Confidence:\u003c\/b\u003e Engineered to seal effectively after a proper break-in, helping minimize oil consumption and power loss.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eClean the cylinder bore and ring lands thoroughly before installation to prevent micro-particle scoring.\u003c\/li\u003e\n\u003cli\u003eInspect the ring gaps and stagger the end gaps per Yamaha\/service manual guidance to minimize blow-by.\u003c\/li\u003e\n\u003cli\u003eLubricate rings and pistons with clean engine oil prior to installation to reduce initial wear during startup.\u003c\/li\u003e\n\u003cli\u003eInstall the rings in the correct order and orientation; use a proper piston ring expander to avoid bending or nicking rings.\u003c\/li\u003e\n\u003cli\u003eVerify proper ring seating by performing a careful, gradual break-in procedure with varied throttle and loads as recommended for Yamaha engines.\u003c\/li\u003e\n\u003cli\u003eKeep the work area free of debris and avoid introducing oil, dirt, or metal shavings into the crankcase during assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eWorn piston rings allow blow-by, reduced compression, and elevated oil consumption, which sap throttle response and overall reliability. Replacing with an STD bore piston ring kit restores proper sealing and compression, delivering dependable power for trail riding or farm work and helping your ATV stay dependable when it matters most.\u003c\/p\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319264518518,"sku":"192.04811","price":25.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/pistonring_468724b5-e455-4282-aa7c-28247b8f3914.png?v=1774886126","url":"https:\/\/dgtagri.co.uk\/products\/piston-ring-kit-yamaha-yfm-350-yfm-400-f-fw-fb-std-1987-2011","provider":"DGT Agri","version":"1.0","type":"link"}