On the supersports the fuel pump is on full time, see if you hear it cutting out. unlike a injected bike this pump is on 100% when running.
make sure the tank is getting air to replace the fuel used or it will not get fuel, this happens when the air line into the tank is pinched off, possibly a check valve installed backwards. make sure you can blow air into the tank but not out.
Check that you do not have a clogged fuel filter inside the tank or that the gas tank was sealed with a coating like por-15 or kreeme. If something is plugging the fuel exit then you will starve the bike under steady full acceleration. go after the fuel starvation first and if nothing shows up look at spark which is less likely.
Before I bought the bike the carbs needed work...it was leaking fuel from the carbs the first day I looked at it. A mechanic from a local bike shop added an external fuel filter with new lines and cleaned out the carbs, then it drove fine and is not leaking fuel at all.
I have driven this bike for a hundred miles before this started happening. Ive had it near 100mph once with no issues. I have driven it on the highway a couple of times prior to this happening and Ive done some twisties at a park for extended periods with no issues.
Heres what I found so far:
+++I am hearing a lot of clicking from the tank area or under it, when it bogs out. Im also hearing a click when I first drive off that Im not sure Ive ever heard before. It sounded like an old school clock ticking once per second, at a stop light today.
When I blow air into the tank, through the check valve, I can hear air going into the tank and I can hear it coming back out of the cap/carrier at the same time. When I put my hand over the cap it quiets the tiny amount of escaping air.
(I restored the entire fuel cap weeks ago, it had sludge inside the lock mechanism. Since that cleaning it closes flush and functions much better. I have not checked the green carrier gasket yet, but I will soon. This is the tank that leaks when propped up that we talked about).
When I blow back into the check valve, I can blow air out of the tank. I can hear air coming out of the other end of the tube at the ground if I cover it with my finger then remove it...then I can hear it releasing. I have to blow hard for a tiny amount of air to come out.
When I turn the key on, the fuel pump stays running, I gave it about 30 seconds a couple of times and it didn't change in pitch or stop. It did start with a higher pitch the first time, then it settled and ran steady. Is there a way to check this as Im stalling out? Do they click when they go out?
I was afraid to look, but I took a flashlight to the tank. It is slightly discolored in spots with very small amounts of rust around the fittings. Overall not as bad as I thought. Im not seeing debris.