last summer i had a v&h full system installed with jet kit and k&n filter. after i got the bike it ran like shit so i took it back. second time i got it back it ran better but around 4500 it seems to surge at a steady speed. also if i whack the throttle between 4-5 grand it bogs real bad.. the mechanic said he needs to raise the needles another .5mm does this sound like it would take care of my problem. one more thing when it is cold and you rev it up it will backfire thru the exhaust and shoot a pretty blue flame out the exhaust about a foot.
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92 blue and white 1100
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92 blue and white 1100