Re: New Canadian Guy Here
Welcome to the forum. Before you can get useful advice we need to know what bike it will go on, what kind of skills do you have, how interested are you in the mechanical aspect of this, what kind of budget are you working with? What kind of riding situation... real hilly? Are you a big guy (heavy)? These are the kinds of things that would help lead to useful answers.
You are aware of the illegality of home made gas bikes in Canada, right? You might want to ask one of those guys you see riding how they're doing with the powers that be. Electric is more expensive, but legal anyway. I still can't figure out why a place with 1.2 bazillion chain saws all going at the same time is worried about a handful of motor bikes. Good luck with your venture.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...