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KTM issue with getting bike down to idle

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I'm not sure of the exact definition of a hanging idle, but here is what my bike is doing.

It's a 2005 KTM200 with a Kehnin carb (I am pretty sure w/o TPS).

The bike ran fine previously and I had some posts on here about a starting issue. In order to troubleshoot the starting issue, I used starting fluid 👍:banghead: and I now know how horrible it is for a motor.

Anyhow, it starts fine and even runs pretty well, but when I am riding the revs bounce (hi then low) to a bit lower of a RPM but it never settles into a nice smooth idle.

Air screw is about 1.75 turns out.

Carb specs are:

185 main

45 pilot

Blue needle 4th position

65 slide

If I could describe the sound as I let off the gas it sounds like nuun, nuun, nuun, nuun, nuun and it keeps doing this. Again the rpm's drop a bit each time it revs, but it will not get down into an smooth idle. With my hands off the throttle and at a stop, it's still going nuun, nuun, nuun at a rather high RPM.

Could the reeds have become damaged from the starting fluid and need replacing? I have pulled the carb and cleaned it 5 times in the last 2 weeks and I know it's clean and not plugged up.

Any thoughts?

Edited by deeman

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Sounds like to me with out looking at it first hand that you have an air leak in the base/head gasket area. when you suck air /rpm raise and the bike will run very leak. enough in most cases to fry a piston. using starting fliud in never a good idea even if it does work you should never need to use it if all things are as they should be. also check for a cracked air boot .........

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