{"product_id":"blue-line-big-bore-kit-w-head-4t-72cc-64mm-valves-139qmb-1100-1439","title":"Blue Line Big Bore Kit w\/ Head 4T (72cc, 64mm Valves); 139QMB","description":"\u003cp\u003eBlue Line Complete 72cc High-Performance Big Bore Cylinder Kit for 50cc 4-stroke 139QMB engines.\u003c\/p\u003e\u003cp\u003eOriginal Parts For Scooters SKU 151-280-47mm\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNOTE: \u003c\/strong\u003eBefore ordering, remove the valve from your scooter's head and measure the full length of the valve stem. This kit works with 64mm valves. If your scooter has 69mm valves, you'll need the following \u003ca href=\"https:\/\/www.scooterworks.com\/products\/blue-line-big-bore-w-head-72cc-69mm-valves-qmb139\" title=\"big bore kit 72cc 69mm valves 139QMB\"\u003e69mm big bore kit\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003ePump up that weak engine to a respectable 72cc displacement, on a budget. This kit is not intended to make your scoot a screaming race machine. It is intended to get you that extra power you need. (Most Chinese 50cc's only put down around 1.5hp to the ground.)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1 - Head Assembly with 64mm valves\u003c\/li\u003e\n\u003cli\u003e1 - Iron Cylinder with 47mm bore\u003c\/li\u003e\n\u003cli\u003e1 - Piston with Rings (Not Pictured)\u003c\/li\u003e\n\u003cli\u003e1 - Wrist Pin \u003c\/li\u003e\n\u003cli\u003e2 - Circlips\u003c\/li\u003e\n\u003cli\u003e2 - Exhaust studs\u003c\/li\u003e\n\u003cli\u003e2 - Intake Studs\u003c\/li\u003e\n\u003cli\u003e1 - Base Gasket\u003c\/li\u003e\n\u003cli\u003e1 - Head Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e139QMB-based 50cc \/ 80cc engines with the following engine codes:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable width=\"463\" height=\"100\" style=\"width: 87.0908%;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e139QMA\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e1P39QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e1P39QMA-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eYN139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eJJ1P39QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e139FMA-2\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eBD1P39QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eBN139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e147QMD\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eOther QMA models\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eOther QMB models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDon't see your engine listed? If the engine code includes \"QM\" or \"FM\", this product is compatible with your vehicle.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout Blue Line:\u003c\/strong\u003e Blue Line offers OEM equivalent replacement parts for on-road scooters. Blue Line parts are a direct-fit replacement when OEM parts are unavailable or overly expensive for your scooter. Since 2018, Blue Line has provided quality parts at great prices.\u003c\/p\u003e","brand":"BLUE LINE","offers":[{"title":"Default Title","offer_id":47671886381221,"sku":"1100-1439","price":63.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/2627\/1141\/files\/1100-1439_bf1f4d35-52e3-44dd-b191-3a0ab5ff1480.jpg?v=1774953191","url":"https:\/\/classicscootersusa.com\/products\/blue-line-big-bore-kit-w-head-4t-72cc-64mm-valves-139qmb-1100-1439","provider":"Classic Scooters USA","version":"1.0","type":"link"}