{"product_id":"for-2005-21-yamaha-yz125-yz-125-54mm-bore-cylinder-top-end-piston-kit-w-gasket","title":"For 2005-21 Yamaha YZ125 YZ 125 54mm Bore Cylinder Top End Piston Kit w\/ Gasket","description":"\u003ch2\u003e54mm Bore Cylinder Top End Piston Kit for Yamaha YZ125\u003c\/h2\u003e\u003cp\u003eThe 54mm bore cylinder top end piston kit is a complete rebuild set for Yamaha YZ125 models, pairing a 54mm cylinder with a matching piston, rings, wrist pin, and gaskets to restore compression on the top end.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis 54mm bore cylinder top end piston kit gives Yamaha YZ125 owners a full top end replacement in one package. The cylinder and matching piston work together to seal the combustion chamber and restore the compression a tired two stroke loses over time. It is aimed at riders and shops rebuilding 2005 through 2021 YZ125 machines that are due for a fresh top end.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e54mm bore cylinder sized to match the included piston\u003c\/li\u003e\n\u003cli\u003ePiston kit includes rings, wrist pin, and circlips for assembly\u003c\/li\u003e\n\u003cli\u003eGasket set included for sealing the top end during rebuild\u003c\/li\u003e\n\u003cli\u003eCylinder bore machined for consistent ring seal and compression\u003c\/li\u003e\n\u003cli\u003eDesigned as a direct fit replacement for the listed YZ125 years\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha YZ125 2005-2021\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop end rebuilds when compression has dropped or the piston is scored\u003c\/li\u003e\n\u003cli\u003eMotocross and trail riding where fresh top end power matters\u003c\/li\u003e\n\u003cli\u003eRebuilds after a seizure or lean condition has damaged the piston\u003c\/li\u003e\n\u003cli\u003eRoutine refresh cycles on a two stroke race bike\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCylinder top end piston kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e54mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMachine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha YZ125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYears\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2005-2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What else should I replace during a top end rebuild? \u003cstrong\u003eA:\u003c\/strong\u003e It is common to inspect the small end bearing, power valve, and coolant hoses while the cylinder is off. Replacing the small end bearing alongside the piston is standard practice.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do I need to check piston to cylinder clearance? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, clearance should be measured against the spec for your model before assembly. Verify ring end gap as well so the new top end breaks in correctly.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":50553943949398,"sku":"ZZ3M01815","price":344.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_93249617-050e-46f0-922b-96c7b12201ce.jpg?v=1790864642","url":"https:\/\/www.solidspare.com\/products\/for-2005-21-yamaha-yz125-yz-125-54mm-bore-cylinder-top-end-piston-kit-w-gasket","provider":"Solid Spare","version":"1.0","type":"link"}