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Message: <blockquote data-quote="nms" data-source="post: 57646">First off, I have absolutely NO actual hands-on experience messing with engines on bicycles.  I am relatively new to this.  BUT, given that I am fairly familiar with bicycles in general, I can try to offer you a few pointers.Is the bike in question really a road bike, or is it a hybrid?  ( I have a hybrid, and it weighs in at about 37 lbs - more than most mountain bikes.  I also have a road bike, and it weighs about 25.)  If it's a road bike, the frame and wheels may not be up to the task of absorbing the power put out by the 80cc motor.  80ccs puts out a lot of power, and the frame may just not be strong enough to deal with the stresses and vibrations.If you could find the weight of the bike in question that would help a lot in determining if it might be up to the job.Hope this helps,nms</blockquote>