{"product_id":"yamaha-450-os-rings-yfm-450-kodiak-yxr-450-os-0-25-2003-2014","title":"Yamaha 450 OS 0.25 Piston Ring Kit Fits YFM450FA 03-06 YFM450FG 07-14 YFM450FX 06-10 YXR450F 06-09 Kodiak Rhino","description":"\u003cdiv\u003eOS 0.25 oversize piston ring kit for 450cc ATV engines found in Kodiak and Rhino models. This kit is designed to restore factory-like compression, tighten oil control, and seal the bore under demanding off‑road and farm work. It fits the YFM450FA (03-06), YFM450FG (07-14), YFM450FX (06-10), and YXR450F (06-09) configurations, delivering reliable power and crisp throttle response after high mileage or tough terrain. Replacing worn rings with this OS 0.25 kit helps reduce oil consumption and blow-by, helping you start easier and pull cleanly from low RPMs. Over time, wear on the top and secondary compression rings can allow compression leaks, while tired oil rings lose their wiping action on the bore. This aftermarket replacement provides an affordable, hard‑working solution that returns proper ring lands and sealing capability, giving you dependable performance on rough trails or busy farm days without breaking the bank.\n\u003ch3\u003e\u003c\/h3\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\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eYFM450FA Kodiak 450\u003c\/td\u003e\n\u003ctd\u003e2003-2006 OS 0.25 oversize kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eYFM450FG Kodiak 450\u003c\/td\u003e\n\u003ctd\u003e2007-2014 OS 0.25 oversize kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eYFM450FX Kodiak 450\u003c\/td\u003e\n\u003ctd\u003e2006-2010 OS 0.25 oversize kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eYXR450F Rhino 450\u003c\/td\u003e\n\u003ctd\u003e2006-2009 OS 0.25 oversize kit\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\u003eNot specified in listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePiston Ring Kit (OS 0.25 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\u003eYamaha 450cc ATV engines: YFM450FA 03-06; YFM450FG 07-14; YFM450FX 06-10; YXR450F 06-09\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOversize\u003c\/td\u003e\n\u003ctd\u003eOS +0.25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRing Configuration\u003c\/td\u003e\n\u003ctd\u003eTop compression ring, second compression ring, oil control ring (3-ring kit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContents\u003c\/td\u003e\n\u003ctd\u003eTop compression ring; Second compression ring; Oil control ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions \/ Bore Size\u003c\/td\u003e\n\u003ctd\u003eNot specified\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\u003e190.04392\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003ctd\u003eOS oversize 0.25 kit; no explicit OEM cross-reference provided in listing; verify against Yamaha diagrams for your exact year\/model\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\nThe OS 0.25 piston ring kit for Yamaha 450 is designed to restore compression and proper oil control. The box typically includes the following components, aligned with standard Yamaha 450 OS ring kits:\n\u003cul\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 control ring\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cem\u003eRelated parts such as pistons, wrist pins, and circlips are not included.\u003c\/em\u003e\n\u003ch3\u003e\u003c\/h3\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 Yamaha 450 OS oversize applications for Kodiak and Rhino engines, ensuring proper ring land engagement and seal geometry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOEM Cross-Reference Support:\u003c\/b\u003e Designed to mirror OEM performance while offering a cost‑effective alternative; cross-reference compatibility may help with model-year variations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePremium Materials \u0026amp; Precision Machining:\u003c\/b\u003e Oversize rings engineered to restore compression and seal integrity while minimizing friction and wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePerformance Restoration:\u003c\/b\u003e Reclaims throttle response, smoother starts, and consistent power delivery after many miles of rough terrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOil Control \u0026amp; Blow-By Reduction:\u003c\/b\u003e Reestablishes proper wiping action to curb oil consumption and reduce blow-by under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eValue for Trail \u0026amp; Farm Use:\u003c\/b\u003e A practical, affordable aftermarket option built for reliability in demanding outdoor conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eVerify bore compatibility:\u003c\/b\u003e Ensure bore size matches OS 0.25 oversize specification before installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRing orientation \u0026amp; spacing:\u003c\/b\u003e Install each ring in its proper orientation and stagger end gaps to minimize blow-by.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCleanliness is critical:\u003c\/b\u003e Thoroughly clean all ring lands and grooves; remove carbon buildup to avoid binding rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eUse assembly lubricant:\u003c\/b\u003e Apply light engine oil to rings and piston skirts to prevent dry friction during initial startup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRing expander and careful handling:\u003c\/b\u003e Use a proper ring expander to avoid nicking or deforming rings during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRing gaps \u0026amp; seating:\u003c\/b\u003e Position gaps away from each other (e.g., 120 degrees apart) and verify final seating before reassembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Upgrade?\u003c\/h3\u003e\nRunning a worn piston ring set leads to reduced compression, increased oil consumption, and rough, unreliable starts. This OS 0.25 kit restores sealing and oil control, delivering dependable power and smoother operation when you’re pushing a Kodiak or Rhino through rough trails or long farm days. Replacing the worn rings with this kit helps bring the engine back to reliable, factory-like performance.\u003c\/div\u003e","brand":"ATV City","offers":[{"title":"Default Title","offer_id":57319264715126,"sku":"192.04892","price":19.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0302\/0406\/files\/image_2026-02-25_144830630.png?v=1774886126","url":"https:\/\/dgtagri.co.uk\/products\/yamaha-450-os-rings-yfm-450-kodiak-yxr-450-os-0-25-2003-2014","provider":"DGT Agri","version":"1.0","type":"link"}