80 cc throttle issues

Discussion in 'Motorized Bicycle General Discussion' started by mobbin, Mar 9, 2016.

  1. mobbin

    mobbin New Member

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    the throttle stays at full speed i cannot control my speed, i slow down only by using my brakes , Any advice on this?
     
  2. Legwon

    Legwon New Member

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    check your carb. slide is most likely in backwards, and sitting open.
     
  3. Flathead

    Flathead Member

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    Check cable to handle?
     
  4. donphantasmo

    donphantasmo Member

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    Many things can be the problem. But, since this is a very vague entry, I can only tell you a very vague answer.

    Check every connection, from throttle (where you twist) itself, connection, to the pin in the carburetor.
     
  5. 2door

    2door Moderator
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    Welcome to the forum, Mobbin. You've come to the right place for help. When asking for advice it's always a good idea to tell us what engine and carburetor you have. Is it a 2 stroke or 4?

    Assuming it is a Chinese 2 stroke engine the problem is very possibly what Legwon suggested. The throttle slide, or barrel, in the carburetor will go in two ways. One way it will give you the problem you're having. The barrel has two slots; one on each side. The shorter slot should align with the idle speed screw. The longer one should align with the small pin you'll see protruding from the bore where the barrel rides.

    With the air cleaner removed, look into the carburetor and watch the barrel as you twist the handlebar grip. You should see it move up and down. It should be spring loaded to the down (idle) position and lift when you twist the throttle grip toward you as you're sitting on the bike.

    Throttle cable tension is also important. If you didn't find the problem let us know. There are other things we can suggest.

    Tom
     
    #5 2door, Mar 11, 2016
    Last edited: Mar 11, 2016
  6. leo

    leo Member

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    could it be outside air leaking into the intake???
     
  7. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Did you install the throttle return spring on top of the slide?
     
  8. 2door

    2door Moderator
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    Six days and the OP hasn't responded. Either he found the problem or didn't like the advice we gave. Too bad people can't respond to help when it's offered.

    Tom
     
  9. mobbin

    mobbin New Member

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    i found the problem it was the screw on the carb that needed to be adjusted to fit . thanks for advice
     

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