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Ktm 250 excf idle problems! Help!

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I've just bought a ktm 250 excf and if I have the idle so it won't cut out and blip the throttle the revs will stay high for a while then drop back down, if I have it so the revs don't stay high it won't tick over and just cuts out. I've cleaned the carb out, the fuel screw has a new o ring. I know the jets in the carb have been changed. Starting to wonder whether they've got wrong jets in? Anyone else has this problem?

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It's called hanging idle

You make no mention of the fuel screw position or hot start, which is where your problem will be, assuming the passage above the pilot jet is not partially clogged.

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