Hey,
I just got into this electric go-kart stuff and I found a very nice motor that I think will work perfectly - Mars ME0909 - 48V, 100A cont., 300A for 30 seconds. Full info here https://www.electricmotorsport.com/me0909-pmdc-motor-12-48v-4-hp-cont-12-8-hp-pk.html
Now, most of the...