{"product_id":"piston-ring-kit-yamaha-yfb-yfm-250-std-1989-2009","title":"Piston Ring Kit For Yamaha YFB 250 And YFM 250 ATV STD Bore 1989 2009 Fits Yamaha ATV Engines","description":"\u003cdiv\u003e\n\u003cp\u003eThis piston ring kit is a precise standard-bore replacement designed for Yamaha YFB250 Timberwolf and YFM250 Wolverine ATVs, covering model years from 1989 through 2009. It’s engineered to restore compression, reduce oil consumption, and revive throttle response, delivering smoother operation in trail rides or farm work. With this kit, you can restore engine seal and power without the cost of OEM parts, making it a reliable choice for both DIY enthusiasts and professional mechanics.\u003c\/p\u003e\n\u003cp\u003eBuilt to endure off-road use, the kit features materials and tolerances chosen for durability under heat cycling and abrasion. The chrome-plated top rings resist heat and wear, helping to minimize blow-by and maintain consistent compression. This aftermarket replacement is designed to drop back into the engine with a true-fit feel, providing long-term reliability for rugged terrain and high-RPM conditions.\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\u003eYFB250 Timberwolf\u003c\/td\u003e\n\u003ctd\u003e1992-2000 (Timberwolf, standard models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFB250 Timberwolf\u003c\/td\u003e\n\u003ctd\u003e1992-2000 (4x4 variants with enhanced terrain handling)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFB250U Timberwolf\u003c\/td\u003e\n\u003ctd\u003e1992-2000 (utility-focused models for farm\/work use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM250 Moto-4\u003c\/td\u003e\n\u003ctd\u003e1989-1991 (entry-level sport models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM250B Big Bear\u003c\/td\u003e\n\u003ctd\u003e2005-2009 (larger utility with improved towing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYFM250X Wolverine\u003c\/td\u003e\n\u003ctd\u003e1999-2004 (recreation-focused with agile handling)\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\u003e4BD-11610-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Ring Kit for standard bore engines\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 YFB250 and YFM250 ATV engines (74mm standard bore, single-cylinder configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-carbon steel with chrome-plated top rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eBore size: 74mm; Compression ring thickness: 1.5mm; Oil ring thickness: 2.0mm; Overall set height: 2.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size Compatibility\u003c\/td\u003e\n\u003ctd\u003eStandard 74mm bore; designed for engines without overbore modifications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdditional Technical Attribute\u003c\/td\u003e\n\u003ctd\u003eTension rating: 15-20 psi for sealing under high RPM\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\u003e4BD-11610-00-00\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eOEM Yamaha reference; equivalent aftermarket 74mm standard-bore piston ring kit compatible with Yamaha YFB\/YFM250 engines\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\u003eThe kit includes the essential rings required for one standard-bore Yamaha 250 engine piston:\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 Assembly\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Piston itself, circlips, and other related components are not included.\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 Engine-specific 74mm standard-bore configuration for Yamaha YFB\/YFM250 models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Clear reference to Yamaha OEM part 4BD-11610-00-00 with reliable aftermarket parity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials:\u003c\/b\u003e High-carbon steel with chrome-plated top rings for improved wear resistance and heat tolerance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration:\u003c\/b\u003e Restores compression, reduces blow-by, and improves acceleration and fuel economy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliability in Off-Road Conditions:\u003c\/b\u003e Built to withstand rugged terrain, high RPMs, and dust exposure typical of trail and farm use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCost-Effective Maintenance:\u003c\/b\u003e A durable aftermarket option that delivers OEM-like performance without the OEM price tag.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify bore size with precise measurement; this kit is for 74mm standard bore, no overbore modifications.\u003c\/li\u003e\n\u003cli\u003eClean the cylinder, ring grooves, and piston surfaces thoroughly before installation.\u003c\/li\u003e\n\u003cli\u003eLightly coat all rings with clean engine oil before seating to prevent dry friction on initial startup.\u003c\/li\u003e\n\u003cli\u003eInstall the top compression ring with the correct orientation as indicated by any stamping or bevel on the ring face.\u003c\/li\u003e\n\u003cli\u003eStagger ring end gaps to avoid a continuous gap line across the piston sweep for optimal sealing.\u003c\/li\u003e\n\u003cli\u003eFollow a proper piston-ring seating break-in procedure as recommended by the engine manual to ensure long-term sealing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eWorn piston rings allow blow-by, increase oil consumption, and reduce compression, which lowers power and causes rough idling. Upgrading to this standard-bore kit restores compression and reliability, delivering smoother starts, better throttle response, and consistent power output in demanding off-road or farm conditions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319264354678,"sku":"192.04801","price":18.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/pistonring_7b979bc8-91fb-42df-b324-ee2d4f5d3b19.png?v=1774886131","url":"https:\/\/dgtagri.co.uk\/products\/piston-ring-kit-yamaha-yfb-yfm-250-std-1989-2009","provider":"DGT Agri","version":"1.0","type":"link"}