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Erratic and Surging idle

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so my 03 cr250 has been giving me headaches. it has a surging and almost erratic idle that also happens when you down shift or ride any less than 1/2 throttle. Went through almost every jet size and a few different kinds of reeds with no luck. please help

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Test for air leaks,

don't ride it until you've confirmed the crankcase is sealing properly, count yourself lucky you haven't seized or damaged the engine yet.

 

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6 hours ago, mlatour said:

Test for air leaks,

don't ride it until you've confirmed the crankcase is sealing properly, count yourself lucky you haven't seized or damaged the engine yet.

I know there is a small crack in the front of my case that was JB welded. i have a feeling it didn’t stick and that is where my air leak is. Definitely gonna get on the pressure test this afternoon. Thanks for the tip??

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