The throttle grip on my 75 CB400F seems to need quite a few degrees of rotation to reach full throttle. I was at a bike shop yesterday and felt the throttle on new bikes (Ducati, Triumph, BMW, Aprilla, MV Agusta). They actually all felt the same. It seems like I have to really strain my wrist to reach full throttle on my CB. My bike is very original and I don't want to hack it up but is there a way to quicken the throttle?