{"product_id":"piston-ring-kit-honda-trx-300-os-0-50-1988-2000","title":"OS 0.50 mm Piston Ring Kit For Honda TRX 300 FourTrax 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000","description":"\u003cdiv\u003e\n\u003cp\u003eOS +0.50 mm Piston Ring Kit for the TRX300 FourTrax engine offers a precise bore-size restoration for model years 1988 through 2000. Designed to renew the piston rings to the correct 74.50 mm bore, this kit helps restore compression and oil sealing for reliable trail and farm performance. Built to meet or exceed stock specifications in a cost-effective aftermarket package, it provides a dependable rebuild path without OEM pricing tags.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket replacement focuses on restoring ring seating and sealing surface integrity after years of wear, delivering consistent power and reduced oil consumption on rugged off-road use. With an oversize +0.50 mm configuration, it returns the engine to dependable operation, making it a smart choice for riders and workers who rely on their TRX300 for daily tasks and weekend adventures.\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\u003eTRX300 FourTrax\u003c\/td\u003e\n\u003ctd\u003e1988-2000 (OS +0.50 mm kit for 74.50 mm bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eTRX300FW FourTrax 4x4\u003c\/td\u003e\n\u003ctd\u003e1988-2000 (OS +0.50 mm kit for 74.50 mm bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eTRX300 (General)\u003c\/td\u003e\n\u003ctd\u003e1988-2000; applicable to +0.50 OS kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eData verified via OEM catalogs and aftermarket cross-reference references for TRX300\/TRX300FW compatibility.\u003c\/p\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\u003e13031-HC4-306\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Ring 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\u003eHonda TRX300 FourTrax (1988-2000); TRX300FW 4x4 (1988-2000)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCast Iron (OE-style piston rings; exact proprietary composition not disclosed by all listings)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size\u003c\/td\u003e\n\u003ctd\u003e74.50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOversize\u003c\/td\u003e\n\u003ctd\u003e+0.50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Ring Count\u003c\/td\u003e\n\u003ctd\u003eTop Ring x1; Second Ring x1; Oil Ring x2; Oil Ring Spacer x1\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\u003e13031-HC4-306\u003c\/td\u003e\n\u003ctd\u003eHonda OEM\u003c\/td\u003e\n\u003ctd\u003eRING SET, PISTON (0.50); TRX300 FourTrax 1988-2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e51-223-05\u003c\/td\u003e\n\u003ctd\u003eWSM\u003c\/td\u003e\n\u003ctd\u003eAftermarket piston ring set compatible with Honda TRX300 FourTrax (1988-2000); uses +0.50 oversize rings\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 kit includes the following components for one piston, ready to install on the TRX300 engine:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003eTop Ring\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eSecond Ring\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOil Ring\u003c\/b\u003e (x2)\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eOil Ring Spacer\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: This kit contains piston rings only. Piston, pins, circlips, gaskets, and other related components are not included unless specified elsewhere.\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 TRX300 FourTrax (1988-2000) and TRX300FW 4x4, ensuring seamless installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Backed by established OEM references (13031-HC4-306) with reliable aftermarket alternatives for cost efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAccurate Oversize Restoration:\u003c\/b\u003e +0.50 mm oversize to restore ring seating, compression, and oil sealing on worn bores.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOE-Style Materials \u0026amp; Geometry:\u003c\/b\u003e Cast Iron rings designed to mimic original cross-section and seating behavior for reliable heat expansion and wear characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComplete Ring Set:\u003c\/b\u003e Includes top, second, oil rings, and spacer for one piston, simplifying rebuilds and reducing missing parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCost-Effective Performance:\u003c\/b\u003e Delivers OEM-grade performance at a fraction of the price, helping you get back on the trail or job faster.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePrepare the top end: drain oil, remove the cylinder head, and inspect the bore for scoring or glazing before installing a +0.50 mm oversize kit.\u003c\/li\u003e\n\u003cli\u003eUse a proper ring-expansion tool to avoid ring damage; install rings in the correct order (top ring, second ring, then oil rings with spacers).\u003c\/li\u003e\n\u003cli\u003eInspect ring grooves and piston lands; clean all surfaces and lightly oil rings before installation to prevent galling.\u003c\/li\u003e\n\u003cli\u003eOrient ring gaps per service manual recommendations and keep gaps staggered to minimize blow-by; ensure correct ring orientation on the piston.\u003c\/li\u003e\n\u003cli\u003eReassemble with new gaskets as needed, then torque head bolts per the factory pattern and perform a careful break-in procedure as recommended in the service manual.\u003c\/li\u003e\n\u003cli\u003eAfter running-in, perform a leak-down and compression test to verify a proper seal and ring seating before returning to service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eRunning a worn piston ring set on a TRX300 engine can lead to persistent blow-by, reduced compression, and oil consumption that erodes performance under load. This aftermarket replacement restores proper bore clearance and sealing, reestablishing reliable power and oil control for continued trail, work, and play.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319262126454,"sku":"192.04533","price":16.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/pistonring_7b6db238-46cd-4942-800a-5f105091d294.png?v=1774886191","url":"https:\/\/dgtagri.co.uk\/products\/piston-ring-kit-honda-trx-300-os-0-50-1988-2000","provider":"DGT Agri","version":"1.0","type":"link"}