The goldwing uses a similar design, of course with lots of safety features included. I was thinking I could use a small 12v motor, possibly a starter, to engage either the idler sprocket for the chain off the jackshaft, or somehow engage the jackshaft itself. Of course I would need a much bigger battery than the Yerf came with, which I had planned on doing anyways. The thought of using a big starter is a bit off putting though, as they spin stupid fast, unless you have some giant gear for it to mate with, even with a big flywheel/flexplate on the original engine, it still will spin that engine around 400-500 RPM, thats a bit too fast to be backing out of a trail in a buggy even if you were to use a gear the same size, lol.
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