I need advice about putting on an engine on a 12 inch wheel
Take an old battery-powered drill and mimic building the frame you see in this picture of my awesome nerd bike.
Ignore the electrical outlet, it will just confuse you.
This won't power the bike all the way, it'll just make pedaling a lot easier.
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ok..well, I think you'll need to be a bit more specific.about the problem though. And a few details about the engine and the frame would be helpful as well
BTW, it seems you have two of these question up. You would be wise to delete one or the other, since it just confuses readers to see two identical questions.