{"product_id":"50mm-gy6-50cc-139qmb-performance-cylinder-kit","title":"50mm GY6 50cc (139QMB) Performance Cylinder Kit","description":"\u003ch2\u003e50mm Performance Cylinder Kit for GY6 50cc Engines\u003c\/h2\u003e\u003cp\u003eThis 50mm performance cylinder kit is designed for 50cc QMB139 4-stroke engines, providing a significant boost in power with the upgrade to an 80cc capacity. It includes all necessary components such as the cylinder, piston, piston rings, wrist pin, circlips, head gasket, and base gasket. This kit is an important choice among \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e for those looking to improve their engine's performance. Proper installation is important to prevent engine damage, especially when used with stock cylinder heads.\u003c\/p\u003e\u003ch3\u003eInstallation Considerations\u003c\/h3\u003e\u003cp\u003eWhen installing this performance cylinder kit, be prepared to adjust your engine casing for a proper fit of the larger cylinder. It is advisable to pair this kit with the QMB139 performance cylinder head for improved performance, as some stock heads may not be compatible. Using a stock head without modifications can lead to serious engine issues.\u003c\/p\u003e\u003ch3\u003eComponents Overview\u003c\/h3\u003e\u003cp\u003eThis kit features a cylinder bore of 50mm, with an outer diameter of 54.9mm for the cylinder sleeve. The wrist pin diameter is 13mm, and the total piston height is 34.8mm, with a compression height of 18.3mm from the center of the wrist pin hole to the top edge of the piston. These specifications are important for ensuring the performance gain and fitment of the components.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Bore:\u003c\/strong\u003e 50mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Sleeve Outer Diameter:\u003c\/strong\u003e 54.9mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist Pin Diameter:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Piston Height:\u003c\/strong\u003e 34.8mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 18.3mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis performance cylinder kit fits the following vehicles and engines:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBaja SC50-P\u003c\/li\u003e\n\u003cli\u003eJalon X8 Retro 50cc\u003c\/li\u003e\n\u003cli\u003eLifan\u003c\/li\u003e\n\u003cli\u003ePanterra Fusion 50cc\u003c\/li\u003e\n\u003cli\u003eQingqi QM50QT-4G\u003c\/li\u003e\n\u003cli\u003eQingqi QM50QT-6V\u003c\/li\u003e\n\u003cli\u003eSUNL\u003c\/li\u003e\n\u003cli\u003eSchwinn\u003c\/li\u003e\n\u003cli\u003eStrada\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.\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-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":"Magic Cars","offers":[{"title":"Default Title","offer_id":52795178483943,"sku":"25-902706","price":118.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/50mm-gy6-50cc-139qmb-performance-cylinder-kit-1.jpg?v=1791584214","url":"https:\/\/www.magiccars.com\/products\/50mm-gy6-50cc-139qmb-performance-cylinder-kit","provider":"MagicCars","version":"1.0","type":"link"}