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Home > Parts > GY6 50 High Performance Parts > GY6 50/85cc Big Bore Kit
GY6 50/85cc Big Bore Kit

GY6 50/85cc Big Bore Kit

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GY6 50/85cc Big Bore Kit
GY6 50/85cc Big Bore KitGY6 50/85cc Big Bore Kit

GY6 50 85cc52mm Four Stroke Cylinder Kit with 52mm Large Head 85cc for the 139QMB Engine

used 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.

Racing Head new improved racing valves



The Leo Vince or GY6 50 Performance Pipe fit best, you want aggressive sound with punch GY6 50 Performance gets that done with the Leo Vince GY6 50 Exhaust smooths over a lower tone with plenty of performance, the actual size of this pipe is smaller than GY6 50 Performance with its stainless steel build and shine the DRag is larger of the two.

These kits are sometimes advertised as 88cc to 90cc. At 52mm = 85cc

FREE SHIIPING



No need to bore out case this is a bolt up kit.

Scootertronics adds value to this kit including Air Filter, Jet plus Manual and the high performance 80cc cam shaft, Some Kymco models may need new rocker arm assembly to match kit which can be purchased seperatly.

  • Kit Includes
  • Cylinder 52mm
  • Piston 52mm
  • Rings
  • Wrist Pin
  • Larger Racing Head with Racing Valves
  • Gaskets
  • 95 Jet
  • Air Filter 39mm UNi or EMGO
  • NCY 80cc Cam Shaft


    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.

    Some but very few engines need special kits like Tomos and SYM let us know and we have the answer for this but its only 47mm 70cc for Tomos.

    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

  • Kymco:
  • Freeway 50
  • Filly 50cc
  • Agility 50cc
  • PEOPLE S 50 4T
  • SUPER 8 50 4T

    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.

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