I've been messing with my carb for a month or so now and its running better than it has before from idle on up to 3/4 throttle but from 3/4 to full not so good. Right now I'm running a 65 pilot, and a 168 main (stock for my 88 XR600 is 60 pilot, 165 main). If I'm going "slow" (1st gear) rolling the throttle on it starts to die and backfires constantly when I hit 3/4 throttle until I let off. I tried putting the choke on 1/2 position and rolled the throttle on up to full and never got any backfires and it ran OK all the way on up to and at full throttle but not great. If I get up to speed in 3rd gear and roll the throttle on when I get up past 3/4 throttle it will continue to run but does backfire occasionally on up to full throttle. At the same time the power feels much, much better (when it isn't backfiring) between 3/4 to full throttle. Am I running a little lean still because turning the choke on 1/2 way helps? Does the backfiring on acceleration from 3/4 to full also mean that its lean on the main? One strange thing I noticed was that whenever I changed a jet and got the beast started again (takes a while) the bike would run awesome for 20 seconds or so then it would settle down and start to do whatever it was going to do. Does that mean anything?