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surging idle

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I've got an 05 wr250, great bike until a month or so ago. For no apparent reason the idle will jet off into space and hang there for quite some time before coming back. I've tried setting it a little richer, and just when I think I got it nailed, it surges again and wakes up my kids and the neighbors.

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It just does it randomly. Start it up, let it warm up with the choke, turn off the choke, let it idle and running fine, then all of a sudden she starts screaming. At this point I havent even touched the bike since I turned off the choke. It's my first 4 stroke so I realise I've got a lot to learn. I think the first thing I need to do is get a bigger hammer, I dont think my 2 stroke hammer is big enough for this one.

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Cozza, you did it. 1/2 turn richer and she has been puring like a kitten for the past 25 min.

THX a bunch!!!!!!!!!!!!!!!!!!

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