4G 1B transmission only: Fits Huasheng 49 & 53cc CC engines

4G Model 1B  8 hole T-Belt Drive Transmission only:   

20T drive to a 100T driven pulley that connects to 9T or 10T chain drive sprocket.   Final drive ratio depends on what bike wheel sprocket is used.   

Final Drive Ratio example:    20T drive pulley to 100T driven pulley to 10T chain sprocket to 50T chain sprocket = 25 to 1 ratio. 


  • 4G Model 1B only fits HuaSheng F142-1G 49cc and F144-1G 53cc taper shaft engines with integral 3 shoe centrifugal clutches.     

  • Use belt # M5-575

  •  If you do not have the above described engine you can add in our HuaSheng 53cc engine along with your transmission order.    We do not sell our HS 53cc engines to customers whom do not have our 4G transmission.    

  • Will not fit 5/8" dia. straight shaft engines like the Honda GXH50.

  • Includes 2 sliding drive sprockets, 9T & 10T, for easy chain alignment;  

  • 9T sprocket for most torque and 10T sprocket gives higher top speed

  • 20T Drive belt pulley. 

  • 100T Driven belt pulley with integral freewheel.  

  • Freewheel allows easy bike pedaling when engine is not running.   

  • Belt Cover is ABS plastic.  Held on with a 3 point attach bracket.

  • Includes a belt tension adjustment spanner wrench. 

  • Has 8 mounting holes to enable using 10G Multi Speed kit.    See our 10G add for details on how to make your bike shift gears like a motorcycle. 

  • Bikes in pictures are Not included, shown for illustration purpose only.

  • Check out our www.grubeeinc.com information web page for more details and info. 

  • Should you want to buy a ready made 4 STROKE ENGINE motorized bike made by a professional company we recommend the CHEATA BIKE COMPANY based out of Milwaukee Wi.      www.cheata bikes.com See attached pictures of their masterpieces.