{"product_id":"88cc-big-bore-kit-52mm-50cc-139qmb-gy6-50","title":"88cc Big Bore Kit (52mm) - 50cc (139QMB) \/ GY6 50","description":"\u003ch2\u003e88cc Big Bore Kit for QMB139 and GY6 50 Engines\u003c\/h2\u003e\u003cp\u003eThis 88cc big bore kit upgrades a 49cc\/50cc scooter for stronger performance. It uses a 52mm cast iron cylinder built for the 139QMB engine family. Riders often pick it when they want a noticeable boost in acceleration and hill-climbing ability. It is one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that can make your ride feel livelier.\u003c\/p\u003e\u003ch3\u003eLarger Engine Displacement\u003c\/h3\u003e\u003cp\u003eRaising the displacement to 88cc gives the engine more torque and a higher top speed. The cast iron body is durable enough for everyday riding. The cylinder bore is precision honed to lower friction and help the rings seat properly, which supports steady engine performance.\u003c\/p\u003e\u003ch3\u003eFitting Notes\u003c\/h3\u003e\u003cp\u003eFitting this kit usually means machining or cutting the engine case so it clears the larger cylinder skirt. An engine bore tool is recommended for making those changes accurately. Doing the installation carefully helps the engine perform well and last longer.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 52mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e CSC Go Max (GO MAX cylinder and crankshaft diagram) with 139QMB \/ GY6 50 engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eCompatible with:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCSC Go Max\u003c\/li\u003e\n\u003cli\u003eOther GY6 50cc (139QMB) scooters\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Confirm the engine case is 139QMB or GY6 50. This 52mm kit needs the case machined or cut to accept the cylinder skirt.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere it goes:\u003c\/strong\u003e part #13 on the CSC Go Max cylinder and crankshaft diagram.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOther versions:\u003c\/strong\u003e If you need a 50mm kit for 139QMB engines from 50cc to 81cc, this 88cc 52mm kit is not the right one. Look at \u003ca href=\"\/products\/gy6-50cc-139qmb-cylinder-kit-4t-81cc-iron-50mm\"\u003eGY6 50cc (139QMB) Cylinder Kit 4T (81cc, Iron, 50mm)\u003c\/a\u003e. For the Blue Line 72cc big bore kit with head and 64mm valves, see \u003ca href=\"\/products\/gy6-50cc-139qmb-big-bore-kit-with-head-4t-72cc-64mm-valves\"\u003eGY6 50cc (139QMB) Big Bore Kit with Head 4T (72cc, 64mm Valves)\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrowse 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-cylinder-kits\"\u003eScooter Big Bore \u0026amp; Cylinder Kits\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":51138804187193,"sku":"TT-26836","price":155.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/88cc-big-bore-kit-52mm-50cc-139qmb-gy6-50-1.jpg?v=1794377919","url":"https:\/\/www.trendtimes.com\/products\/88cc-big-bore-kit-52mm-50cc-139qmb-gy6-50","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}