[orange4boy]

Sorry to be a party pooper but an induction motor would require an expensive controller and high power inverter.

A given motor will put out roughly double the hp and rpm with double the voltage. They like to run at a certain rpm and will put out many more hp to get there if loaded up. You can "safely" double the voltage/HP of a motor but have to watch out not to overheat it and probably not run it continuously at double It's rating . I use a $10 digital oven thermometer to keep tabs on my bikes.

For an easy contactor motor EV set up I would look for a used permanent magnet brushed motor. Can be found cheap if you know where to look. Old forkifts, etc. Look for H rated motors (can be run the hottest: low-A, B, F, H-high)

Brushed PMDC is 2 wires, no waiting. Fairly simple to set up a series parallel contactor arrangement. That's how the Auranthetic bikes are set up. They are rated 1 hp cont. but probably put out 3 or more up hills.