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How long has the bike been sitting, how old is the fuel, and have you checked the carbs for clogged jets or water or rust? if all is clean and fresh, when does the problem occur; quick acceleration or easy roll-on? if it happens during quick accel from idle then try a little more on the fuel screws or maybe raise the jet needles one clip position (drop the clip one position). If an improvement is noticed, you're on the right track. If the problem occurs with a smooth, easy, roll-on accel then go up on your mains. watch your plugs anyway just to make sure, and if your carbs are equipped with an accellerator pump, then check the diaphragm as well as its passages to make sure they're working.

good luck, and what kind of bike is it anyway?

if at first you don't succeed, use a bigger hammer
 
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