This is my design on an adjustable jackshaft so the motor can be centered in the frame. The drive gear can be aligned to the back wheel by sliding the gear on the shaft then spacers can be put back in to keep everything tight. The shaft is drilled and tapped with custom aluminum washers on the ends to keep it all together. I like to run it open but made this cover to keep the legs safe. So far I have run this on a couple bikes and it works great.
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