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Re: strange engine issue from 900-1400 rpm
The carb has over flow ports, for a lack of better words, that will allow fuel to leave the carb when it has too much fuel... The carb isn't designed to be under pressure, that's where the floats come into play... Other float will shut off pressurized fuel from your fuel pump... If the float is adjusted to high, fuel will bypass the needle and seat filling the bowel passed its capacity.... Also if you are running an electrical fuel pump, without a pressure regulator, it can also put more fuel in the bowel than it is able to handle.... I think a regular everyday carb should not have no more than 5 lbs of pressure, but I could be wrong with that....
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