{"product_id":"piston-kit-honda-trx-400-fw-std-1995-2003-86mm","title":"Honda Piston Kit TRX 400 FW STD 1995 To 2003 86mm OEM Replacement Fits TRX 400 FW","description":"\u003cdiv\u003e\n\u003cp\u003eThis piston kit is an 86mm standard-bore rebuild component designed specifically for the TRX400FW engine family from 1995 through 2003. It’s engineered to restore compression and power, delivering factory-level performance once again for daily riders and trail work. Featuring an OEM-referenced design (13101-HM7-000), this aftermarket replacement fits the stock cylinder and top-end components for reliable, consistent operation.\u003c\/p\u003e\n\u003cp\u003eThe kit targets common wear issues found in aging top-ends—loss of compression, diminished ring seal, and piston slap that erodes throttle response. By using a forged aluminum piston with a true 86mm bore, it delivers improved heat management and durability, helping maintain predictable power in rugged conditions and on the farm. The compression ratio for this bore size is typically around 8.2:1, aligning with the engine’s original performance characteristics.\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\u003eTRX400FW\u003c\/td\u003e\n\u003ctd\u003e1995–2003\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\u003e13101-HM7-000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Kit (Standard bore)\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\u003eTRX400FW (1995–2003)\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\u003ePiston Material\u003c\/td\u003e\n\u003ctd\u003eForged Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Ratio\u003c\/td\u003e\n\u003ctd\u003eApproximately 8.2:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Components\u003c\/td\u003e\n\u003ctd\u003ePiston, Rings, Wrist Pin, Circlips\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 style=\"width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25.9928%;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"width: 19.9878%;\"\u003eBrand \/ Type\u003c\/th\u003e\n\u003cth style=\"width: 53.2974%;\"\u003eCross-Reference Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25.9928%;\"\u003e13101-HM7-000\u003c\/td\u003e\n\u003ctd style=\"width: 19.9878%;\"\u003eOEM\u003c\/td\u003e\n\u003ctd style=\"width: 53.2974%;\"\u003eAftermarket Replacement equivalent; commonly cross-referenced to Wiseco 4669M08600 (86.00 mm std bore) for TRX400FW\/Foreman 1995–2003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25.9928%;\"\u003e4669M08600\u003c\/td\u003e\n\u003ctd style=\"width: 19.9878%;\"\u003eWiseco (Aftermarket)\u003c\/td\u003e\n\u003ctd style=\"width: 53.2974%;\"\u003e86.00 mm standard bore piston kit for TRX400FW\/Foreman 1995–2003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25.9928%;\"\u003e4669M08700\u003c\/td\u003e\n\u003ctd style=\"width: 19.9878%;\"\u003eWiseco (Aftermarket)\u003c\/td\u003e\n\u003ctd style=\"width: 53.2974%;\"\u003e87.00 mm oversize piston kit as a potential upgrade option\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 piston kit comes with the following components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003ePiston\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eRings\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eWrist Pin\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eCirclips\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ci\u003eNote: Related top-end gasket kit and certain fastening hardware are not included in this box.\u003c\/i\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 the 86mm standard bore TRX400FW engines, ensuring straightforward installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Designed to meet or exceed OEM specs with an exact cross-reference to 13101-HM7-000.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials:\u003c\/b\u003e Forged aluminum piston chosen for strength, durability, and reliable heat management under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration:\u003c\/b\u003e Restores compression and throttle response lost to wear, delivering consistent power on trails and in field work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliability in Tough Conditions:\u003c\/b\u003e Built to withstand dirt, dust, and temperature fluctuations common on trailers, farms, and rugged backroads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCost-Effective Maintenance:\u003c\/b\u003e A high-quality aftermarket option that delivers OEM-like performance at a competitive price point.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003ePre-assembly inspection:\u003c\/b\u003e Inspect the cylinder bore for scoring or out-of-round wear and confirm it remains a true 86mm standard bore before installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCleanliness is critical:\u003c\/b\u003e Thoroughly clean all mating surfaces, oil passages, and the cylinder interior to remove old carbon and debris that could affect ring seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRing orientation and gaps:\u003c\/b\u003e Install the piston rings with the correct orientation and verify end gaps per the ring spec before seating the piston.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWrist pin and circlips:\u003c\/b\u003e Ensure the wrist pin diameter matches the piston and install circlips securely in both ends to prevent pin migration during operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLubrication and break-in:\u003c\/b\u003e Apply assembly lube to the piston, rings, and bore, then follow a proper break-in procedure to seat rings and establish a good seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eInitial run checks:\u003c\/b\u003e After installation, perform a careful check for unusual noises, oil consumption, or loss of compression; address any scoring or binding before returning the engine to service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eRunning a worn piston kit leads to reduced compression, power loss, higher oil consumption, and increased risk of engine damage or seizure under load. Replacing with this 86mm standard-bore aftermarket piston kit restores compression and power, delivering durable performance and dependable reliability for trail rides and farm work.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319258653046,"sku":"190.10001","price":82.67,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/image_2026-02-25_234141873.png?v=1774886125","url":"https:\/\/dgtagri.co.uk\/products\/piston-kit-honda-trx-400-fw-std-1995-2003-86mm","provider":"DGT Agri","version":"1.0","type":"link"}