Long story short, I installed the mufflers that I would tune the bike to, also using the stock air boxes.. My bike was jetted with 135 main jets.
Being that I have after market mufflers, I thought for sure Id need bigger jets. Well I was wrong. I went from a 135, to 137.5 and then a 140. Then I went to a 142.5 and still no improvement, but the stumbling/hesitation was there when I hit full throttle. Then I raised the needle to richen up the midrange, The bike really started to run like crap and I figured out I was way too rich. I have a whole collection of jets now! lol
So I started all over again with new 135 mains. I ended up moving down to a 132.5 and then went down another step to 130.
The 132.5 was where I started to be satisfied with the performance. Still had a very very slight hesitation at the top end like how it was when it was too rich.. So I put the 130s in and the stumble/hesitation is gone..
Ive started to get a weird popping on the left side and when the idle was really low and I believe I was getting pinging. I still thought it was a leak in the exhaust and I ended up sealing both sides and still had the problem. Come to find out, the left side was timed too far advanced.
I should mention that I have the Pamco ignition with the E-advance and the instructions say to check the timing after a certain amount of miles to make sure that the PC boards on the timing plate didnt shift out of place. I guess from all the heat and vibration they loosened up because they werent very tight at all when I adjusted them.