I am guessing you are talking about the axle bearings being out and unless they were froze up it is not really going to slow you down and unless you have ridden a lot of banshees you are not really going to be able to tell if it has had motor work done unless you take it apart and look. Just having it bored is not going to make a big enough defferance for you to be able to tell. It may be ported then that would make it have more power.