Vintage go kart with a snowmobile engine

I built a go Kart with a motorcycle engine back in the 70s. It was freak'n dangerous. Imagine going 75 MPH on the grass (open cockpit)!! Got pretty scary once you get past 40/45 MPH especially on asphalt when you try to make a turn. It WILL flip over!!

Treblig

That sounds pretty wicked! I don't think I would personally go 70 MPH on a kart, but I still would enjoy the power :D