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My nephew has a problem that maybe someone out there can help with. He just had his KTM 520 motor rebuilt after dropping a valve (I think it was). When he reinstalled it and took it for a ride it ran rough at idle, then all of a sudden it ran at WOT. He thought it was a stuck cable but has removed and replaced the carb twice and still has the same problem. Everything looks normal (slides, needle, cables look free and clear) but when he kicks it over it starts up wide open.My thought is that it has to be in the carb somewhere so he has to go through it again, but since he's already gone that route a couple of times I thought I'd throw the question out there for any ideas about most likely causes or where else to look. Anyone? Thanks. Maybe if I help he'll teach me some stunts.
Thanks Mike. I'll run down there and check it out this weekend.
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