{"product_id":"hayden-primary-chain-tensioner-big-twins-39-1200","title":"Hayden Primary Chain Tensioner - BIG Twins — Harley-Davidson Super Glide, Tour Glide Classic, Electra Glide Classic (1974-1993)","description":"\u003cp\u003eHayden primary chain tensioner for V-twin big twins, automatically maintains proper chain tension during acceleration and deceleration to eliminate slack and reduce drivetrain noise. Smoother shifting and a noticeably quieter transmission are the immediate benefits.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatically adjusts primary chain tension\u003c\/li\u003e\n  \u003cli\u003eReduces transmission clunk during shifts\u003c\/li\u003e\n  \u003cli\u003eSmoother acceleration and deceleration\u003c\/li\u003e\n  \u003cli\u003eQuieter drivetrain operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Hayden\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e M6-BT65\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 4.45 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 7 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 2.25 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.1959 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits V-twin big twin motorcycles including Harley-Davidson and Indian Motorcycle models.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWill this eliminate all transmission noise?\u003c\/h3\u003e\n\u003cp\u003eIt reduces clunk and clicking by maintaining consistent chain tension. Some noise is normal in V-twin primaries — this minimizes slack-related sounds.\u003c\/p\u003e\n\u003ch3\u003eDo I need any special tools to install this?\u003c\/h3\u003e\n\u003cp\u003eInstallation requires basic hand tools and access to the primary cover. Consult your service manual for your specific model's procedure.\u003c\/p\u003e\n\u003ch3\u003eWill this work on my Sportster?\u003c\/h3\u003e\n\u003cp\u003eThis part is engineered for big twin models. Sportster primary designs are different — verify fitment before ordering.\u003c\/p\u003e\n\u003ch3\u003eHow long does a tensioner typically last?\u003c\/h3\u003e\n\u003cp\u003eHayden tensioners are built to last the life of your bike with proper maintenance. Replace if it no longer maintains tension or shows fluid leakage.\u003c\/p\u003e","brand":"Hayden","offers":[{"title":"Default Title","offer_id":53035043094639,"sku":"39-1200","price":115.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_3c61327d-e423-4b90-83b2-128162c3a1a5.png?v=1779560764","url":"https:\/\/vtwinbikers.com\/products\/hayden-primary-chain-tensioner-big-twins-39-1200","provider":"Vtwinbikers","version":"1.0","type":"link"}