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1987 cr250 idle issues

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My 1987 cr250 idles good when it's cold but when it warms up it idle high and low.

I cleaned the carberator really good and even tried another one still having the same result.

I haven't tried a new slide. The current one has minor wear marks but not too bad.

My fuel to oil ratios is 31-1, and I have tried everything with the air and idle adjustment on the choke and still get the same result.

Does anyone have any advice?

Thank you

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does it do the same thing with the air screw all the way in?  kinda sounds like an air leak but it should do it when its cold weird

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