From experience...needles dont wear...they just slide up and down
...what you should make sure of is that the seals ( which look like rubber seats ) are properly sealed...after rebuilding the carbs I would start at closed and open 2 turns then adjust from there...I used to do mine by starting at 2 turns open from close and go 1/4 turns from there....never did the vacuum hose thingy...just by ear
like I said earlier..also if the exhaust is modified...I would bump the jets say from 35 to 37 or 38....
KD
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