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It sounds like condensation in the gas tank has reached a point where water in the gas is a problem.
Drain the carburetors. There should be a screw on the lower side or bottom of each carb float bowl. Remove the screw then replace it after the fuel drains. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.
FOR EACH carb > Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Put the carb back together and install. Clean or replace the air filter and install an in-line fuel filter. Let the float bowl fill then start the engine. This process should get you back on the road. ALWAYS have a fire extinguisher at hand when working on carburetors.
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Yes, once you remove the baffles this reduces the back pressure hence clearing the engine cylinders more quickly, this means a leaner fuel mixture, go up maybe 2 sizes, run the bike and just check the performance or even easier maybe dyno tune.
Best way to get one of those apart is to cut the wires on each side and replace the plug.
Try replacing the fuel filter too.
Coils will do stuff like that too.
Possible fuel restriction?
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