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Home > Parts > High Performance Scooter Parts > 139QMB GY6 50 High Performance Upgrades > GY6 50/85cc Big Bore Kit  GY6 50/85cc Big Bore Kit GY6 50 85cc52mm Four Stroke Cylinder Kit with 52mm Large Head 85cc for the 139QMB Engineused in Schwinn, Kymco,Diamo, Geely, Avanti, SYM, TNG, Q Link, Roketa, Tank Meitain and many others.Now comes with High Performance Cam Shaft, this is the trick and really brings out the power. These are sometimes advertised as 88cc to 90cc. FREE SHIIPINGNo need to bore out case this is a bolt up kit. Scootertronics adds value to this while including Air Filter, Jet plus Manual for complete scooter upgrade plus we are always here to help On some scoots depending on your location and whether or not you are ridding in hot humid air ,dry desert air, cool mountain air will determine air filter use, some scoots run better with stock box some with high performance. We can help you with these types of problems if your scooter is not running at top performance once kit is installed. New exhuast repair kits come these kits also which are the top quality for performance and really get you going fast as you can get, we race this kit at 55 on lots of curves so if we can get it so can you. Some Roketa, Vento, SYM, Tomos take special kit so please call us if you have one of these engines, some are labeled 1P39QMB, we offer special made 47mm kits for these scooters and have done these types in our shop. Manual is great tool so use it well tells you how to take off and put back all parts with each step explained. The GY6 50 139QMB is used in many Asian made scooters as well as Chinese basically any scooter made in Asia uses this engine some are Flyscooters, Schwinn, Kymco, PGO (imported by Genuine Scooter Company in the USA), Peirspeed, Ricardo Motors, Roketa (some models), Strada, SUNL, Tank, Yamati, among others. The engine is stamped with 139QMB/A on the engine at center stand. Great quality on 85cc kits imported from Tawain not cheap chinese thrown in a box. These do not fit Baja 50 or Vento 49cc four stroke scooters We have installed on some Verucci, Tank, Geely, Roketa, Starda, Meitian as well as Pep Boys scooters with a huge difference with both take off and top end. This is it a true 85cc kit that bolts right up. Some have experience some mods have to be done to as add gaskets for longer rods but only on certain off brands not common to scootertronics. When adding this kit its best to add new jet size of 95 plus 38-39mm Uni or EMGO air filter. Not just a sales pitch but whats needed to get everything you can to get racing now.We include anyway 52mm 85cc 4 stroke GY6 82cc upgrade for 4 stroke Chinese 50cc engines like Schwinn 50cc QMB 139 includes head with titanium springs bigger valves more performance than 70cc kit. This engine (139QMB) is used in scooters from Kymco, Diamo, Schwinn, Q Link Geely, Roketa, Tank, Avanti, Meitian, Strada Verucci and most 50cc four stroke scooters plus many others made in China. This kit works great on GY6 50 139QMB/A engines found in Chinese clones as well as We also use the 52mm 85cc kit in our shop for mods done in MD. In 2009 we will start doing 54mm kits in our shop for QMB engines, these we will bore out for racing, have to be real careful not to blow up. |  | Free T Shirt Over 399 Free Cover Scooter Purchases
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