TBH, I think electric reverse would be a fairly easy (and inexpensive) to do it. I am not comparing it to the other options as I have no info on them, but if you mounted (I forget what its called) its a flywheel (I think) that will just spin and spin when the motor goes in foreword, but the once the reverse electric motor kicks in it allows travel in the backwards direction...Again I forget what its called. Its what allows bikes to coast... But if ya got one of those on the motor to stop it from burning out when the kart goes in foreword, you can engage the electric in reverse and do that. And if ya got a forklift motor you would only need 12/24v. So you might not even need another battery.
just my 2ยข
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Yerf-Dog Spiderbox
Reverse Gearbox
Heavy Duty Ball Joints
Heavy Duty Chain Tensioner
Canvas Roof/Netting
Key Start
LED Brake Lights
Headlights
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