pads

hi i have a xj750 trike and some one has fitted a xj600 set of carbs with k&n filters, just managed to get it started today but it is over reving , in its self it sounds fine but will not shut down to a tickover, throttle cable fine , idle turned down but still over revs , the only thing i can think of now is that the jets or the needle needs changing , thank you for any help.

hello my name is paul and i am a new member,i am trying to do up a xj 750 trike