My '86 has been running like a top until today. When I trist the throtle from idle i get a hesitation and back firing from the exhaust and (it sounds like) from the carb. I run seafoam through it with every tank full and I rebuilt the carbs last year. I've put 500 miles on it since the carb rebuild and this is the first time I/ve had a problem. It idles great and I have no problem with power when I'm riding it. I was going to marble it but I want to address this problem before I change anything. I did notice that the hoses that recieve the marbles are cracked at the reed valve. Could this have anything to do with my problem? I haven't drilled out my mixing screws yet. On another note, do I need to adjust my valves? I'm starting to hear a light ticking sound while riding.