One thing that "old school" go karts have going for them is that there is usually a steel plate onto which is mounted a horizontal shaft engine. This makes it really easy to get a kart with a 2-3hp engine and replace it with a larger one later on when your kid is a bit bigger.
I'm not sure what to suggest for a 5 year old, but if your son was a couple of years older I would be recommending a two-seater with a roll bar. Two-seater because then if your son has a friend over they can ride together rather than waiting turns, and roll bar because they WILL manage to roll it. Ask me how I know 
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Grant
In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 1995 Toyota Land Cruiser, 2011 Pursuit 315 OS, 2022 Tesla Y
Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S
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