{"product_id":"gy6-50cc-139qmb-crankshaft-16-tooth","title":"GY6 50cc (139QMB) Crankshaft (16 Tooth)","description":"\u003ch2\u003eReplacement Crankshaft for 139QMB Engines\u003c\/h2\u003e\u003cp\u003eThis crankshaft assembly is made for 139QMB engines and includes a 16-tooth oil pump drive. The main bearings come already installed, so it is ready to fit. Keeping this component in good condition matters for engine output and dependability. It is one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e you can swap out to get your scooter running smoothly again.\u003c\/p\u003e\u003ch3\u003eCompatibility and Function\u003c\/h3\u003e\u003cp\u003eThis crankshaft suits a range of 50cc and 80cc engines, specifically those carrying the 139QMB engine code. Its job is to link the piston to the transmission so power is passed along efficiently. If your engine code includes \"QM\" or \"FM,\" this crankshaft should match your vehicle.\u003c\/p\u003e\u003ch3\u003eConstruction Details\u003c\/h3\u003e\u003cp\u003eThis crankshaft assembly is built to OEM specifications and has exact dimensions for steady operation. The tapered end uses an M10x1.25 thread, and the spline end uses an M12x1.25 thread. It has 26 splines and a 41.4mm stroke.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 41.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length:\u003c\/strong\u003e 247mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size (tapered side):\u003c\/strong\u003e M10x1.25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size (spline side):\u003c\/strong\u003e M12x1.25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Outer Diameter (tapered side):\u003c\/strong\u003e 42mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Outer Diameter (spline side):\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Splines:\u003c\/strong\u003e 26\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Teeth (oil pump drive gear):\u003c\/strong\u003e 16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 139QMB-based 50cc and 80cc engines with 16-tooth oil pump drive (139QMA, 139QMB, 1P39QMB, 1P39QMA-2)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e139QMB-based 50cc engines (16-tooth oil pump drive)\u003c\/li\u003e\n\u003cli\u003e80cc engines (139QMB-based, 16-tooth oil pump drive)\u003c\/li\u003e\n\u003cli\u003eEngine codes: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD\u003c\/li\u003e\n\u003cli\u003eOther QMA and QMB models (16-tooth oil pump drive)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check that the oil pump drive gear has 16 teeth and the crankshaft has 26 splines. An engine code containing QM or FM indicates compatibility.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc Scooter Parts (139QMB)\u003c\/a\u003e · \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-engines\"\u003eScooter Engines \u0026amp; Engine Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138788753465,"sku":"TT-26753","price":48.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/crankshaft-16-tooth-for-gy6-50cc-139qmb-1.jpg?v=1794377796","url":"https:\/\/www.trendtimes.com\/products\/gy6-50cc-139qmb-crankshaft-16-tooth","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}