Go Kart Gearbox How To Use A Vertical Shaft Lawnmower (with Auto Drive) In A Go Kart?

How to use a vertical shaft lawnmower (with auto drive) in a go kart? - go kart gearbox

I have an old Hayter Harrier 41 Auto Drive VS (http://www.hayter.co.uk/products/homeowner/mowers/rear-roller/harrier-41-autodrive-VS/) and I and some friends wanted to use in a Go Kart, I wonder if I run the device of the motor change compared with the same speed as the engine, or is this thing crumble. If you are not doing what I am in a field of bevel gears.