Chances are you have water in the carb. Remove the float bowl and empty it. You might get away with just losening off the bowl nut. If that's not it, back out the high speed needle half a turn (if adjustable needles are fitted). If not adjustable, then if probably IS gummed up. You will have to strip and clean it.
One other possibility - VERY stale fuel will also do this.
Phil Saunders
November 2007
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