has any one had a problem with the engine being hesitant between 4 9 thousand rpm on an import .i have had the carbs off and cleaned with compresed air and carb cleaner, through all the jets,float chambers pilot screws etc.i bought new plug ,leads but nothings seems to have made any differance to the problems. i have now to many splinters from head scratching and are in search of a hero to save me... the bike seems like its only running on 3 pots between 4 an 9 thou under load and stood still.. cant way it up boys.. carbs balancing may be ? but if you rev the engine slow through the complete rev range its seems ok in both conditions,under load and free reving ?????? ... am clutching at straws gentlemen