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so, its fine when you wot but not so fine when you slowly pull back. the fuel height is fine, the carb is thuroughly cleaned, it has correct sized jets, the choke is not engaged (does the choke work? when idling and you pull the choke, it jumps to 4krpm right?), there are no vacuum leaks (did you test this? hair spray or carb cleaner- spray it near the carbs or something if the bike jumps up its pulling from the air which means vacuum leak), the diaphram is seated correctly and not torn.... what about the needles? are the needles perfectly straight? what about the slides? maybe you could lubricate the slides? are you sure theres no leak in the diaphram?
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