Hesitation with low throttle at cruising speeds
Bought a 2003 750 about two weeks ago for a good price and I've been doing some small things to get it up to spec (as much spec as I can personally get it to at least). One thing that's been the focus of a lot of my attention is at low throttle, it has issues cruising at constant speed. This is particularly noticeable at speeds of 20-50 miles per hour. It'll move fine, but hesitate once in a while, pretty similar to what's described when the carb vent hose isn't going into the right ear or its bottoming out in there. Jerking a bit, hesitating once in a while, almost seems like it's starving for fuel or something for a split second and you can hear the engine skip or whatever when it hesitates. If I open up the throttle, it kinda goes away for a little bit, but will work its way back in. The bike pulls hard and has no trouble accelerating all the way through the RPM range. Things I've done to remedy this...
Cut the carb vent hose at 45 deg angle and seated it inside the air cleaner box. I've run 3-4 tanks of gas with seafoam through it. This comes out to less than one can total so far, but the can is almost empty. I cleaned the foam air filters, I sealed the air filter housing with duct tape. I checked the carbs and they were sync'd up perfectly. The decel cable was stuck so I removed it, and noticed that my accelerator cable has stretched out over time and there was so much slack that it was almost forming a loop at the carb end where it attaches. I pulled it, re-routed it as best as I could, and even with the adjusters all the way out, there's still a bit of slack at the carb end with the throttle cable. I have a mild suspicion this is it, being that that slack seems to influence the throttle response a bit. I don't get much loud "backfiring" although it has done that one or two times since I got it. It does, however, pop a lot when I'm decelerating and it makes it kinda sound like a harley. Doesn't sound like it's a problem but there's a lot of people that complain about popping and stuff on here so I can't tell if it's normal or not.
Should I be adding more seafoam at a higher seafoam:gasoline ratio? Any chance this will help clear it up? The bike does seem to be running smoother and smoother as I've done these tasks, just seems like that low throttle hesitation continues. It almost seems like it doesn't even do it all the time, as I've told myself several times, "I think it's fixed!" only to be disappointed. Stuck something in the carb? Engine messed up? No clue here!
I've got more guts than experience when it comes to motorcycle maintenance, but really don't want to pull the carbs if I don't have to, as this seems like a PITA and difficult based off other posts I've read. The bike is also old and I'm pretty sure I would destroy 50 parts in the process of removing the carbs lol. I put on a throttle cable from motionpro and that thing honestly seemed like it was a foot too long. I routed it all over the bike and it still had too much slack, therefore, I've ordered a different one that I'm hoping is the correct length.
Anyways, sorry to be spitting out words like a fire hose here, just want to have as many details as possible for whomever is reading.