I just purchased a 1992 CBR 600 from a guy and he claimed that he drove it to work multiple times this year and that the only problem with it was that the carbs need cleaned. It ran really rough and rich when I first got it so I took everything apart and cleaned the carbs perfectly. It runs way better now and revs all the way up while in neutral. However, when I try to ride the bike, it will only rev between 3-4k and just doesn't want to rev any higher. I have read multiple forums and have not found out anything to help me yet thus far. If you have any ideas as to what the problem could be, please let me know!! Thanks!