Idleing too high
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Thread: Idleing too high

  1. #1
    Senior Member ssgtrillium's Avatar
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    Idleing too high

    While I was away at the camp last weekend my bike started to rev up a bit and start to idle to high.I noticed that most times if I pulled out the inricher knob and pushed it back in that it would idle down to normal.Any ideas what would cause this? Also the last few weeks when I start the bike cold it idles high for a few minutes like it has an automatic choke then it's fine but now it's doing it much more often.I will first check for vacuum leaks but any other ideas would be helpful.

  2. #2
    Super Moderator littletommy's Avatar
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    Sounds like time for a strong dose of Seafoam...
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  3. #3
    Senior Member ssgtrillium's Avatar
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    I'm going to do that first thing when I get home.I hope it's not something that will require me to remove the carb again.I know it's not a big job but I had it off so many times last year that I just don't feel like doing it again for a while..I know..I'm a whiner!
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  5. #4
    Senior Member VintageGW's Avatar
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    Quote Originally Posted by ssgtrillium View Post
    While I was away at the camp last weekend my bike started to rev up a bit and start to idle to high.I noticed that most times if I pulled out the inricher knob and pushed it back in that it would idle down to normal.Any ideas what would cause this? Also the last few weeks when I start the bike cold it idles high for a few minutes like it has an automatic choke then it's fine but now it's doing it much more often.I will first check for vacuum leaks but any other ideas would be helpful.
    At first blush I would suggest a sticking float valve but only a guess. I agree that taking the carb out is a painful event but after you check for vacuum deals, it may be the next best thing to do. As much as I like the seafoam route, the ultrasonic cleaner has been a much better answer for me. Removing all the jets, and cleaning all the runs and ports may be more fruitful, followed by a several minute bath in the ultrasonic if you have one available. I replaced a missing spring on the needle jet and it returned my idle to normal. I have a thread on that a few months back. https://tw200forum.com/forum/technica...turn-idle.html
    Let us know how it goes.
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  6. #5
    Senior Member JustPassinThru's Avatar
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    check a crack in the intake manifold, also. An air leak can speed up the idle

    Otherwise, it could just be a creeping idle screw. You can turn it back with your fingers...right by the choke; big hex-head phillips screw
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  7. #6
    Senior Member admiral's Avatar
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    If you think something is ill on the bottom, after loosening the boot clamps and removing the throttle cables, you can just turn the carb. This would be ok if you're inspecting/removing jets for instance by removing the carb bowl. Saves some time removing the entire carb, though I've gotten really quick at removal and installation of the carb. Either that or my airbox boot has gotten softer with all my removing of the carb. But yes, I sigh everytime I have to remove the carb so I get it! The good thing now is I don't have any problems with the carbs (both TW's).
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