Originally Posted by 2door
Just a word of caution based on experience. Make sure the kid has some respect for the amount of work/money that will go into motorizing a bike. I built a nice little bike for a nephew and found it laying on it's side in his back yard, tires flat, chain off and the engine seized due to lack of lubrication.
Some kids will appreciate the gift, some won't. I even let this nephew be involved with the build but he still had no respect for what he had. Make sure your boy understands that its more than just a bicycle before you invest the time and dollars into that project.
My Nephew did the same, I fixed it a few times, but these bikes are to be stored inside dry and maintained, or all the fun goes away quickly. Hope everyone has a great Christmas!