{"product_id":"piston-ring-kit-honda-trx-400-os-0-75-1995-2003","title":"Piston Ring Kit OS 0.75 Fit For Honda TRX 400FW Foreman 1995 Through 2003 Engine Rebuild Replacement","description":"\u003cdiv\u003e\n\u003cp\u003eThis OS 0.75 oversize piston ring kit is engineered to refresh the 400cc four-stroke Foreman platform’s top end. It fits the TRX 400FW Foreman models produced from 1995 through 2003 and uses an 86 mm bore with a +0.75 mm oversize to compensate wear. The result is restored compression, reduced oil blow-by, and renewed power for trail work or farm duties.\u003c\/p\u003e\n\u003cp\u003eDesigned as a reliable aftermarket replacement with geometry matched to the 86 mm bore, this OS 0.75 kit targets common wear like compression loss and rising oil consumption found on high-mileage engines. The tailored ring set delivers a durable seal under varying load and temperature, making it a dependable choice for rugged trail riding or farm duties where downtime isn’t an option.\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 400FW Foreman\u003c\/td\u003e\n\u003ctd\u003e1995-2003; 86 mm bore; OS 0.75 oversize piston rings (TRX 400FW Foreman platform)\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\u003e13041-HM7-003 \/ 13041-HM7-004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Ring Kit (Oversize 0.75 mm)\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 400FW Foreman (1995-2003), 86 mm bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size\u003c\/td\u003e\n\u003ctd\u003e86 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOversize\u003c\/td\u003e\n\u003ctd\u003e+0.75 mm (OS 0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRing Count\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\u003eMaterial \/ Construction\u003c\/td\u003e\n\u003ctd\u003eHigh-grade alloy steel with hardened\/cr chrome-faced ring faces\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\u003e13041-HM7-003\u003c\/td\u003e\n\u003ctd\u003eHonda OEM\u003c\/td\u003e\n\u003ctd\u003eRING SET, PISTON (0.75) OS kit; Teikoku or Riken variants; paired with 13041-HM7-004 for complete 0.75 OS kit on TRX 400FW Foreman (1995-2003)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e13041-HM7-004\u003c\/td\u003e\n\u003ctd\u003eHonda OEM\u003c\/td\u003e\n\u003ctd\u003eRING SET, PISTON (0.75) OS kit; Teikoku or Riken variants; paired with 13041-HM7-003 for complete 0.75 OS kit on TRX 400FW Foreman (1995-2003)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e13011-HM7-003\u003c\/td\u003e\n\u003ctd\u003eHonda OEM\u003c\/td\u003e\n\u003ctd\u003eRING SET, PISTON (STD) 0.50 mm; part of TRX 400 ring families; not the exact oversize kit but related cross-reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-OS075-TRX400FW\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eOS 0.75 oversize aftermarket cross-reference; designed to fit TRX 400FW Foreman (1995-2003); matches bore and end-gap expectations\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\u003eIn the box you’ll find the essential components for a complete piston-end seal refresh on your TRX 400FW:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003ePiston Ring Set (0.75 mm oversize)\u003c\/b\u003e\u003c\/li\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\u003eNote: This kit does not include the piston, wrist pin, circlips, or gaskets.\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 an 86 mm bore with +0.75 mm oversize for reliable seal and proper ring end-gap alignment on the TRX 400FW Foreman platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e 1:1 references to OEM part numbers 13041-HM7-003 \/ 13041-HM7-004 with documented cross-compatibility, offering a factory-like rebuild at a fraction of OEM price.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials:\u003c\/b\u003e High-grade alloy steel rings with hardened, chrome-faced surfaces to resist wear and maintain compression across temperature ranges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration:\u003c\/b\u003e Restores original compression and reduces oil blow-by, helping to prevent top-end failures during demanding trail or farm work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliability in Rugged Conditions:\u003c\/b\u003e Engineered for durability in dirt, dust, and loading scenarios typical of 4x4 work and off-road use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCost-Effective Rebuild:\u003c\/b\u003e Aftermarket replacement that delivers OEM-style fit and performance without OEM pricing, enabling timely, repeatable engine refreshes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify the cylinder bore is 86 mm and confirm the oversize matches +0.75 mm before installation.\u003c\/li\u003e\n\u003cli\u003eOrient the top compression, second compression, and oil rings correctly; stagger end gaps per the service manual to minimize oil blow-by.\u003c\/li\u003e\n\u003cli\u003eUse a proper ring compressor sized for an 86 mm bore and a light coating of assembly lube on all rings before seating them in the cylinder.\u003c\/li\u003e\n\u003cli\u003eClean the piston lands, grooves, and cylinder walls; remove all debris to prevent scoring and false seating of the rings.\u003c\/li\u003e\n\u003cli\u003eInspect the piston, ring lands, and cylinder for scoring or damage; replace any damaged components to ensure proper seal.\u003c\/li\u003e\n\u003cli\u003eAfter assembly, perform a careful break-in at light load for the first 15 minutes and avoid high RPM until rings seat and compression stabilizes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eRunning a worn piston-ring set on a 400cc Foreman can lead to persistent compression loss and increasing oil consumption, which accelerates wear and reduces performance. Replacing with the OS 0.75 oversize kit restores sealing efficiency and helps return reliable compression, throttle response, and overall engine longevity. This rebuild-friendly kit is built to endure the demands of trail riding and farm work, reducing downtime and the risk of costly top-end failures.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319261798774,"sku":"192.04504","price":17.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/pistonring_1397c9c5-3a4c-4204-ba08-4fad61527a4c.png?v=1772044372","url":"https:\/\/dgtagri.co.uk\/products\/piston-ring-kit-honda-trx-400-os-0-75-1995-2003","provider":"DGT Agri","version":"1.0","type":"link"}