Just picked up on this again, remember seeing a couple of pics a few years ago.
Does anyone know if it actually ever saw the light of day ?
I will copy some of the text as well and paste up here from this thread.
"The Sachs MadAss 500 Concept purports to use the Royal Enfield engine made in India. It's a low-tech carbureted 22 horsepower engine with five speed manual transmission and a top speed of 70 mph on a good day, down a hill, with a tail wind"
From The Scooter Scoop
So yes by the looks of things it's an Enfield motor, but that isn't necessarily a bad thing. Firstly, they do about 80mpg, which I know isn't the be-all and end-all but it looks like it has a tiny fuel tank...
Secondly, they do versions of the same engine with about 30bhp, so the estimate above may be pessimistic, which should be nearer 100mph. And hop-up kits are easily available to bring nearer 40-50bhp and 600cc+
Thirdly, they sound cool Laughing
And with that frame, I'd expect engine swaps to be a doddle