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Keihin idle screw help

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I have a 99 CR250 with the stock Keihin carb. Have a JD jet kit and it runs great.

My problem is the idle screw. Its made of plastic. The idle never stays the same. I can turn the screw in and the idle will go up and then come back down.

Does anyone make a idle screw that is not made of plastic. I think the end of the plastic screw has a flat spot on it now, but I don't want to buy a OEM screw and have it do the same thing. Thanks Guys!!

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