chris is a great guy and think you will be very happy with him and i assume you are from canada. he rides all winter long and can best advise you the set up. if i lived in canada i would be buying my motors from him. he is a member here just go to members list on top and pm him or give him a call. can't wait to here what you go with. i think off road would be a blast with a motor. here is a link to the bike i am going to put a rack mount on.
http://motorbicycling.com/f15/my-mountain-bike-67.html