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Sounds like a fun project!

The problem is controlling the power from the motor - the only really good way of doing that is by an electronic motor controller

If you couple an electric motor to a battery - without any sort of controller - then you will get a lot of torque which will reduce as the motor revs rise

If you can arrange things so that you can use that type of power delivery then you can simply use a big switch -

A much better idea is to use a motor controller! - and for something like a cyclecar most motors come with a simple controller

There are chips inside that controller - but if you leave the lid on you won't have to see them
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