{"product_id":"piston-ring-kit-honda-trx-250-trx-250-ex-os-1-00-1997-2014","title":"OS 1.00 Piston Ring Kit For Honda TRX 250 EX 1997 2014 And TRX 250 Recon 1997 2022 OEM Equivalent","description":"\u003cdiv\u003e\n\u003cp\u003eRestore compression and curb oil consumption with a piston ring kit OS 1.00, a direct-fit, OEM-equivalent replacement designed for Honda TRX 250 engines. This kit covers the Honda TRX 250 EX (Sportrax) from 1997 through 2014 and the TRX Recon (FourTrax) from 1997 through 2022, delivering reliable sealing and improved power on every trail or field task. Engineered to restore ring sealing and oil control, it helps your TRX maintain steady performance under load and across heat cycles.\u003c\/p\u003e\n\u003cp\u003eBuilt for rugged use on trails and farms, the OS 1.00 rings address common wear such as worn ring sealing, increased oil consumption, and compression drop. The kit’s chromium-faced ring faces and high-grade alloy steel construction are designed for durability in dusty, hot environments, making it a dependable aftermarket choice when rings wear and compression suffers during hard use.\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\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eTRX 250 EX (Sportrax)\u003c\/td\u003e\n\u003ctd\u003e1997-2014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eTRX Recon (FourTrax)\u003c\/td\u003e\n\u003ctd\u003e1997-2022\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Reference Part Numbers\u003c\/td\u003e\n\u003ctd\u003e13051-HM8-003, 21-13051-HM8-003 (superseded notation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Ring Kit (OS 1.00)\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\u003eHonda TRX 250 Recon (1997-2022); Honda TRX 250 EX (1997-2014)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-grade alloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRings Included\u003c\/td\u003e\n\u003ctd\u003e3 rings: Top compression ring, Second compression ring, Oil ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOversize\u003c\/td\u003e\n\u003ctd\u003eOS 1.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eChromium-faced \/ Chrome-coated ring faces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003e1 piston ring kit (for one cylinder)\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\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\u003e13051-HM8-003\u003c\/td\u003e\n\u003ctd\u003eHonda \/ OEM\u003c\/td\u003e\n\u003ctd\u003eOriginal Equipment piston ring set; OS 1.00; Cross-ref to 21-13051-HM8-003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21-13051-HM8-003\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eCross-reference to OEM 13051-HM8-003; OS 1.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e13051HS0305\u003c\/td\u003e\n\u003ctd\u003eHonda OEM\u003c\/td\u003e\n\u003ctd\u003eCross-reference variant for TRX\/TRX250 family; OS 1.00 compatibility noted\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\u003eEach box contains the essential rings needed to restore compression on a single cylinder:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003eTop compression ring (OS 1.00)\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eSecond compression ring (OS 1.00)\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eOil control ring (OS 1.00)\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: This kit does not include the piston itself, wrist pin, circlips, or base\/gasket 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 Honda TRX 250 EX and TRX Recon engines for straightforward installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Alignment with Honda references ensures reliable interchange within OEM catalogs and aftermarket listings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium OS 1.00 Materials:\u003c\/b\u003e Oversize restoration with chromium-faced faces for enhanced sealing and oil control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration:\u003c\/b\u003e Reclaims compression, throttle response, and fuel efficiency by eliminating ring-land leakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRugged Durability:\u003c\/b\u003e Built to endure trail and farm conditions where dust, heat, and repeated load cycles are common.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSingle-Cylinder Focus:\u003c\/b\u003e Packaged as a complete ring set for one cylinder, simplifying maintenance planning and installation.\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 excessive wear; micrometer readings and a proper pline check guide recondition the cylinder if needed.\u003c\/li\u003e\n\u003cli\u003eVerify end-gap and compatibility with OS 1.00 rings according to the service manual; improper gaps can cause ring sticking or leakage.\u003c\/li\u003e\n\u003cli\u003eClean all ring grooves, piston's lateral surfaces, and the ring lands thoroughly to remove carbon and debris before installation.\u003c\/li\u003e\n\u003cli\u003eLightly lubricate all rings with clean engine oil before placement to prevent ring stalling during initial rotation.\u003c\/li\u003e\n\u003cli\u003eInstall rings in the correct order (top compression, second compression, then oil ring) and align the gaps to minimize blow-by across the piston crown.\u003c\/li\u003e\n\u003cli\u003eAfter installation, perform a careful break-in procedure and verify compression and oil control during the initial warm-up cycle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eWorn piston rings can allow cylinder wear and oil intrusion to degrade compression, throttle response, and overall reliability. Replacing with this OS 1.00 ring kit restores proper sealing and oil control, returning your Honda TRX to dependable performance in demanding trail and farm conditions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319262617974,"sku":"192.04565","price":18.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/pistonring_584fc6e7-486f-41c6-8bfa-a8804e87fbf5.png?v=1774886131","url":"https:\/\/dgtagri.co.uk\/products\/piston-ring-kit-honda-trx-250-trx-250-ex-os-1-00-1997-2014","provider":"DGT Agri","version":"1.0","type":"link"}