so was out on my bike today and it ran like shit gargling bogging and back fire like fuck when i got up the rev's and steadly got worst...its still starting fine and was running spot on b4 hand i had the carb off a few time's bcuz i taught it was running lean i cleaned it and blew out the jets the bowl was dirty i have to say (rusty tank) but still no luck..could the spark timing be off? or would it be internal prob like a nackered piston? i still think its a fuel issue but as i said iv tried everything with the carb