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Motorcycles are pretty easy to work on and convert to electric.
My motorcycle is a 12 hp Briggs and Statton E-Tek. Works well.
My batteries are Optima Yellow Tops - 55ah lead-acid, four of them, for 48 volts. The Motor is designed for up to 48v, and the controller will do 24-48V.
The controller is 300 amp max, the motor is 150 amp continuous. Motors usually peak at at least double their continuous rating, so it seems to all be a good match. It's worked great so far, at least.
Try to get components that are matched in voltage and amperage. If you don't, you will overpay for one component, but won't be able to take advantage of it because the other components are the weak link.
A $50 EV cycle throttle is most likely a Magura twist grip. It just connects to the controller with two small wires. (There's 3 wires on the throttle, but it's easy to figure out which two you need.)
My motorcycle did cost more than $1000, but a big part of that was that I used basically a new motor ($500) and all new, nice, batteries ($800). Just those two components together would blow a $1000 budget.
It is possible to build a cycle completely from used parts. So a web search for Forkencycle for an example of that.
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