{"product_id":"piston-kit-honda-trx-420-os-2-00-2007-23","title":"OS 2.00 Piston Kit Honda TRX 420 2007-2023 OEM Replacement Quality ATV UTV Direct Fit","description":"\u003cdiv\u003e\n\u003cp\u003eOS 2.00 oversize piston kit designed for the Honda TRX 420 family (2007–2023) brings proven rebuild performance to Rancher and Foreman models. This kit restores compression and steady power across the entire TRX 420 engine range, delivering crisp throttle response and reliable power for daily trail rides, workdays on the farm, or weekend performance runs. Built to align with OEM standards for fitment and longevity, it’s a cost-effective way to refresh your engine and extend service life without compromising reliability.\u003c\/p\u003e\n\u003cp\u003eThis OS 2.00 oversize kit targets worn piston walls and degraded compression, common culprits in reduced power and efficiency on aging TRX 420 engines. By increasing displacement within the engine’s bore tolerances, it helps reclaim torque, throttle consistency, and starting reliability when paired with proper installation practices. It’s tailored for builders who demand consistent performance across varying conditions, from muddy trails to open-field work.\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 420 Rancher\u003c\/td\u003e\n\u003ctd\u003e2007–2023; 2x4 and 4x4 variants within the TRX420 lineup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eTRX 420 Foreman\u003c\/td\u003e\n\u003ctd\u003e2007–2023; 2x4 and 4x4 variants within the TRX420 lineup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eTRX 420 (Rancher\/Foreman family)\u003c\/td\u003e\n\u003ctd\u003e2007–2023; TRX420 engine family across multiple configurations\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-HP5-600; 13102-HP5-600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Kit (OS 2.00 oversize)\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 420 (2007–2023)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-strength aluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiston Oversize\u003c\/td\u003e\n\u003ctd\u003eOS 2.00 (2.0 mm over standard bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Change\u003c\/td\u003e\n\u003ctd\u003e+2.00 mm over standard bore\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: 25.2708%;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"width: 22.3827%;\"\u003eBrand \/ Type\u003c\/th\u003e\n\u003cth style=\"width: 51.6245%;\"\u003eCross-Reference Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25.2708%;\"\u003e13101-HP5-600\u003c\/td\u003e\n\u003ctd style=\"width: 22.3827%;\"\u003eOEM (Honda)\u003c\/td\u003e\n\u003ctd style=\"width: 51.6245%;\"\u003ePiston kit for Honda TRX420; standard bore reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25.2708%;\"\u003e13102-HP5-600\u003c\/td\u003e\n\u003ctd style=\"width: 22.3827%;\"\u003eOEM (Honda)\u003c\/td\u003e\n\u003ctd style=\"width: 51.6245%;\"\u003eAlternate OEM piston kit reference for TRX420 variants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25.2708%;\"\u003e13101-HP5-600 \/ 13102-HP5-600\u003c\/td\u003e\n\u003ctd style=\"width: 22.3827%;\"\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd style=\"width: 51.6245%;\"\u003eDirect cross-reference to OS 2.00 oversize piston kit for TRX420 2007–2023\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 OS 2.00 oversize piston kit is packaged with the core components needed for a proper rebuild routed to the Honda TRX 420 family.\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\u003ePiston Pin\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eCirclips\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Related gaskets, seals, and additional engine components are not included in this kit and should be sourced separately as needed for your specific rebuild.\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 engineered to match the TRX 420 engine family from 2007–2023 for straightforward installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference:\u003c\/b\u003e Clear OEM part-number correlations support reliable troubleshooting and part matching.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials:\u003c\/b\u003e Built from a high-strength aluminum alloy designed to resist heat and wear in demanding off-road environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOS 2.00 Oversize Precision:\u003c\/b\u003e Oversize specification restores compression and enhances piston-wall dynamics within factory bore tolerances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliability for Trail \u0026amp; Farm:\u003c\/b\u003e Durable construction suited for the rough conditions of trails and workdays alike.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eValue-Driven Rebuild:\u003c\/b\u003e A cost-effective alternative to OEM pricing while delivering dependable performance restoration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eVerify bore condition:\u003c\/b\u003e Inspect the cylinder bore for scoring and taper; ensure bore is compatible with OS 2.00 oversize before installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePiston orientation and ring gaps:\u003c\/b\u003e Install rings with correct orientation and check end gaps to factory specs after assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLubrication and assembly lube:\u003c\/b\u003e Lightly coat the piston skirt, rings, and wrist pin with assembly lubricant prior to installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWrist pin and circlips:\u003c\/b\u003e Secure the wrist pin with properly seated circlips; verify retention by gently rocking the piston.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHead gasket and sealing surfaces:\u003c\/b\u003e Clean gasket surfaces and inspect for damage; replace gaskets as needed to prevent leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFollow service manual torque guidance:\u003c\/b\u003e Refer to the TRX 420 service manual for torque specs and sequence during reassembly to avoid distortions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp\u003eA worn piston kit typically leads to reduced compression, loss of power, and inefficient fuel use, with increased heat and potential engine damage over time. This OS 2.00 oversize replacement restores proper compression and piston-wall dynamics, delivering restored throttle response and dependable performance across the Honda TRX 420 lineup for years of reliable riding and work.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319260291446,"sku":"190.10042-7","price":97.5,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/image_2026-02-25_223146797.png?v=1772058714","url":"https:\/\/dgtagri.co.uk\/products\/piston-kit-honda-trx-420-os-2-00-2007-23","provider":"DGT Agri","version":"1.0","type":"link"}