{"product_id":"520-104-o-ring-drive-chain-for-yamaha-yz125-1977-1979","title":"520-104 O-Ring Drive Chain for Yamaha YZ125 1977-1979","description":"\u003ch2\u003e520-104 O-Ring Drive Chain for Yamaha YZ125\u003c\/h2\u003e\u003cp\u003eThis 520-104 O-ring drive chain is a direct replacement chain that transfers engine power to the rear wheel on Yamaha YZ125 models from 1977 through 1979.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe 520-104 O-Ring Drive Chain is built to replace a worn or stretched chain on Yamaha YZ125 machines from the 1977 to 1979 model years. Each O-ring seal holds grease at the pins and rollers to reduce friction and slow wear. Riders rebuilding a vintage YZ125 drivetrain get a fresh chain sized at 104 links.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eO-ring seals between plates retain grease and block grit\u003c\/li\u003e\n\u003cli\u003e520 pitch matches the YZ125 sprocket spacing\u003c\/li\u003e\n\u003cli\u003e104 link count sized to fit the YZ125 swingarm and gearing\u003c\/li\u003e\n\u003cli\u003eRoller design spreads load across the rear sprocket teeth\u003c\/li\u003e\n\u003cli\u003eSealed construction cuts friction and extends chain service life\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ125, 1977\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ125, 1978\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ125, 1979\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTrail riding and woods loops on vintage two-strokes\u003c\/li\u003e\n\u003cli\u003eMotocross practice and race day chain replacement\u003c\/li\u003e\n\u003cli\u003eFull drivetrain rebuilds when sprockets and chain are swapped together\u003c\/li\u003e\n\u003cli\u003eRestoration projects bringing a 1970s YZ125 back to riding condition\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 Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e520-104\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChain Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eO-ring sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePitch\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e520\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLink Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e104\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Yamaha YZ125, 1977-1979\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 How do I know if my YZ125 needs a new O-ring drive chain? \u003cstrong\u003eA:\u003c\/strong\u003e Check for tight spots, rusted links, or a chain that no longer holds adjustment. A stretched chain will hang loose off the rear sprocket teeth and should be replaced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Should sprockets be replaced at the same time as this drive chain? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, worn sprocket teeth accelerate chain stretch and can cause rapid failure. Replacing the chain and sprockets together protects the new chain and keeps wear even.\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":51149320486998,"sku":"OO1C30586","price":93.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_68db9071-59fa-4340-a97f-e5ce15fe042f.jpg?v=1794570668","url":"https:\/\/www.solidspare.com\/products\/520-104-o-ring-drive-chain-for-yamaha-yz125-1977-1979","provider":"Solid Spare","version":"1.0","type":"link"}