You may be able to out race one (may being the key word) on flat ground, but all the power equates to torque, which means they can roll over anything. They can also hook a chain to you, barely.touch the gas, and pull your kart around like a rag doll with you on full throttle lol.
You know the fun part though? Those 2 machines I posed that looks like they would eat the driver alive.... those will do 35 the way they are now in full throttle on flat ground.
Imagine what they can do after taking off all that dead weight, and some simple gearing...
On top of that those engines are built like freaking tanks.
That $100 pred will burn out after a few years of what these guys have seen over the last 60+ years.
And those engines have never been opened either, not once, no need.
I've been in serious talks and many many times gone over that first one. I've been thinking about getting it for awhile to make a cool front engine rat racer.