Tendency to die when idle

Discussion in 'General Questions' started by Kio, Apr 22, 2009.

  1. Kio

    Kio New Member

    Hey all,

    Although, for the most part, it works fine, recently my bike's engine has a tendency to die when it's idle. Even after it's been fully warmed up. I can ride along fine for a while, then come across a stop light...let off the throttle, and then yeah.

    Very occasionally, it will happen very quickly, almost as soon as I let off, but that's pretty rare. More normal is that I'll sit there for a minute or two and it'll happen around that time.

    One more thing...when it does idle, it does sound like it's barely hanging on. Sometimes it'll very nearly cut out but then come back.

    Not really sure where the problem might be. Any suggestions for where I should look?


  2. biken stins

    biken stins Member

    Maybe a air leak. Make sure it is not loose from engine. New gasket and o ring. Is you idle screw still in ? Have you adjusted it ? Fuel getting in carb OK ? Gas filter clean ?
    My main thought would be a air leak. Good luck. Let us know what happens.
  3. 5-7HEAVEN

    5-7HEAVEN Guest

    Raise the idle speed.
  4. Kio

    Kio New Member

    Maybe what's lose from the engine?

    Also, how do I raise the idle speed (sorry, not too familiar with these things).
  5. Kio

    Kio New Member

    Hey guys

    So I got it fixed, runs great now.

    There is a little screw with a spring on the carb. If you look down, using the front of the bike as a reference, it's on the left side. Tweaking this is what fixed it.

    But, can anyone tell me what it does exactly?
  6. biken stins

    biken stins Member

    Idle screw-Changes amount of air being mixed with fuel.
    Among the pages here you will find a so much information.
    Search "Boost Bottle". The posts explain a lot. The search box leads to all info.
    Glad you got it fixed. Enjoy.
  7. Kio

    Kio New Member

    ok cool, thanks!
  8. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Well, you fixed it and found the idle screw......:grin5:

    It's a very simple carb
    there is only one screw which adjusts the idle and NO mixture screw
    unlike more tuneable carbs

    All the idle screw does is raise (or lower) the slide in the
    carb throat by riding on a little ramp on the side of the slide

    If you take the air cleaner off and look into the back of the
    throat you will see how it works

    The only other adjustment you can make on this carb is moving
    the position of the clip on the needle which will make it richer or leaner

    That is accessed by unscrewing the top of the carb where the throttle
    cable enters
  9. 5-7HEAVEN

    5-7HEAVEN Guest

    So which engine do you have?:whistling:
  10. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    He already told you........
    Are you asking if it is a 66cc or a 50cc or the manufacturer? :whistling:
    They all have pretty much the same carb......
  11. 5-7HEAVEN

    5-7HEAVEN Guest

    So you have a Happy Time engine, not a rack mount.