I had a buddies 600 legend do this. I had it running and pulled each plug wire till I found the one it wouldn't run on. I took the carbs off, sprayed the throats, neddles with carb cleaner, put the carbs back on. got the sled warm on a stand. got the motor up to 5-6g then quickly placed my hand(palm) over the faulty carb, which created a vacuum, I did this a few times, it sucked the crap right out. Has ran like a top since. this is a old time trick from the 70's.
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