4 stroke tranny help

Discussion in '4 Stroke Bicycle Engines & Kits' started by GeorgeG, Dec 9, 2019.

  1. GeorgeG

    GeorgeG New Member

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    Hey all

    I recently installed a 49cc kit on a cruiser bike for my dad. (It’s a Christmas gift)
    It has chai drive tranny. The 10 tooth drive sprocket on the output shaft of the transmission loosened up and I lost all the ball bearing out of it. It is like it has a little clutch in it. I can not find a replacement. (See pics) What am I going to do? why does this little sprocket have that clutch in it?
    I wish I could slide a sprocket on the shaft align it and lock it down with a couple set screws done!

    I also did not know you do not get the axle part of the 3 piece crank assembly in the kit.
    what is the easiest/most cost effective fix here.

    thank you all.
    George
     

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  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    If you have a little 110v wire feed welder, just weld it solid (& call it a day)! ;)
     
    fasteddy likes this.
  3. GeorgeG

    GeorgeG New Member

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    I thought about that.
    The thing is the back wheel wants to turn constantly. you can stop it cause the motor is not that powerful, but wondering if I could do anything else.
     
  4. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    If you lower the engine idle speed, it shouldn't spin the wheel anymore.

    Also... The 7G kits don't have that freewheel (& I really like how they work).
     
    azbill and GeorgeG like this.
  5. GeorgeG

    GeorgeG New Member

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    i wonder if that free wheel wheel is something I can add?

    how about this 3 piece crank situation?
    I have a 2” dia. “Hole” for lack of a better term.
    I do not have the middle extended axle, and this so called conversion kit from American to European?
     

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