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

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

20T engine drive to a 100T driven pulley that connects to jackshaft 9T or 10T chain drive sprocket.   

Final drive ratio depends on what bike wheel size and 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

  •  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. 

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

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