I have been building a project bike for 18 months now, finally i have got it on the road. The bike is based on a Honda XBR500, i have used KTM USD front forks, a NC30 swing arm, XL 500 tank, Honda Bros wheels as well as various bits and pieces from other things. My Problem is that i have fitted a KN type air filter and i have a complete lack of power at around 4500 rpm. Can anyone tell me what i need to do to the carb to try and improve this. I have attached a link to bikepics so you can see some photo's of the monster.