put our Heads Together
Join Date: Jun 2003
Location: southeast pennsylvania
Bikes: a mountain bike with a cargo box on the back and aero bars on the front. an old well-worn dahon folding bike
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If the chain saw has a speed control (instead of all-or-nothing) that would be the way to go.
Otherwise, first you want to know if the motor is brushed or brushless. (probably brushed).
Then you want to know the voltage and amperage you are dealing with.
once you know that, you can buy a motor controller (and buy a matching throttle) (a controller is made for brushed motor only, or for brushless motor only) which can handle at least enough amps, and at least enough volts, for your intended use.
you will probably want a motor controller that has a built in amperage limit, in order to avoid destroying your motor, your controller, or your fuses.
I recommend Google Shopping search; search for the words "brushless motor controller" or "brushed motor controller"