Does it have the stock carb?You may have a small pin hole in the diaphragm of the stock fuel pump.It sounds like it,s not getting enough fuel...Re check your fuel/air mixture also...Turn the screws out 2.5 times this will give you a starting point...If you have a vacum guage use it,this will help you tune the carb in...If none of these work take the carb in for a rebuild...
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