If there is a crack in the carb diaphragm it will fall off at the upper speeds because the diaphragm can't lift the slide anymore, just pull the top off the carb and pull it out, hold it to a bright light and really take a close look moveing it around and flexing it. if you have to replace it don't expect any great big gains, it is a 700 and there's only so much HP it can produce but it should be better, probably in the 90's.
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