Idling way to high
I put a new Nibbi PE30 carburetor with #40 pilot jet and #140 main jet and a pod filter on my bike and when I start it, it idles extremely high. When adjusting the idle screw, I have to back it almost all the way out for the idle to come down just a little and the pilot screw has to be backed out 1/8th turn. I’ve tried adjusting the throttle cable, even took the throttle off the carb to make sure the slide sits all the way down and nothing changed. Engine gets hot very fast and the exhaust was glowing red at one point. Not sure what to do? Any ideas?
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Does the engine speed up even more if you turn the handlebars to the right? If so, there's a good chance there isn't enough slack in your throttle cable to allow the carburetor slide to come down against the idle speed screw.
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The slide is probably installed backwards. Look to see if the slides all the way closed. If not, take it out and rotate it 180°
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For reference:
https://www.xmotos.cz/gb/motorcycles...c-4t-2118.html |
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The symptoms do suggest stuck slide, and I thought that you cannot even screw on the cap to close the tower if the tab isn't aligned with the slot in the slide tower.
I believe what you are saying, the only thing I can think of causing high idle is the slide not closing all the way. I don't think an air leak or airscrew could cause a high idle. You jetting seems in the ball park, certainly the pilot (#40). Maybe, just maybe try a #42 ?? I've gotta vote with Jerry on the slide though. It's the elephant in the room :wtf: |
My thought is put old carburetor back on, and see what happens. Bet it will work,it did before .
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