There is alot of information on here and elsewhere on tuning a Mikuni including their tuning manual. I have already read all I could find. BUT, I am going to ask this question anyway. I have a 98 Fatboy, Dave Makie cam (similar to an Andrews 27) Vance Big Shots two into one exhaust and a K and N high flow filter. The bike seems flat when I am accelerating, but idles fine. Terrible gas mileage. Seems to surge when I do the roll off test which says lean. But that doesn't measure up with the bad gas mileage. Thoughts???