just wanna put my 2 cents in.
06 wolverine 450, gytr exhaust, ported head, 11:1 piston, webcams torque cam not overall cam, and hauck modified sheave. Settled on a 140 main and 20 pilot with idle screw out 3 1/4. With just exhaust I ran a 135 and felt it was really close but the pilot was a little lean and it cut out randomly at part throttle steady cruising. Still had this with the 20 pilot after the mods and it cured it backing out the screw another half turn. Tried a 145 and had a bog and generally sluggish feeling to it and even though it ran good with a 135 after the porting and piston, I settled on the 140 to be safe once winter gets here. hope this helps someone in a similar configuration.
these are factory mikuni jets by the way, not dyno jets. I was to cheap to buy the kit. though I did drill out my slide to 7/32 and didn't pick up a noticeable change anywhere.
something a lot of people don't realize is a healthier engine produces a healthier signal to the carb. so it draws more air and since the air is what pulls fuel basically through scavenging over the booster it also pulls more fuel. I feel like a certain carb will only need a narrow window of jetting due to the fact the increased signal draws more air AND fuel. I cant imagine needing a 150 or 160 jet in one of these bikes no matter what is done to the motor. im sure a lot of people wont agree but I see it all the time on drag cars with carbs that aren't matched to the motor. a lot of times too big a carb requires a larger jet and too small of a carb requires a smaller jet than would be expected
