Still backfiring 2003 Yamaha V-Star 1100 Custom
Well, I've had this bike since March of 2015. It has won battles over and over again. I've put maybe 2 miles on it. Rebuilt/cleaned carbs(like 1000 times), rebuilt starter clutch, kremed the tank, new plugs, new ignition coils, oil change, the works. Still giving me hell.
The issues I'm having is when the bike warms up it backfires under load. I can ride 2 laps around my neighborhood and it doesn't backfire but once it gets warm it starts backfiring. The bike purrs at idle, no issues at all, but when I take off on it and it gets warm it will very very very loudly backfire. Equal to a shotgun blast easy as they are low boy shotgun pipes from Cobra.
When I rebuilt the carbs I put in Max Air PMS screws. I was told by someone they only control idle. But I can turn them in all the way and it doesn't affect idle at all. So I turned them out 3 turns each and went from there.
I'm so close to being able to ride it, it starts every time, runs everytime, but it's almost like it's loading up or something.
What would cause the bike to run fine for a couple minutes at idle and under load and then when it's warm backfire like that? Thoughts or tips? I haven't re-jetted the carb or anything as the bike came as is with custom pipes but it also wasn't running when I got it.
I'm looking for a savior. I dumped $176 on new ignition coils because I thought one might be heating up and breaking down but that proved to be a waste of money because I installed the new ones and still get backfire once its warmed up. On a tight budget so any help is appreciated.