So mechanical fuel injection? So like a car that doesn’t run on all cylinders. He said it goes 20mph or whatever probably wouldn’t go as fast as a single cylinder compressor engine and a gravity fed carberator. Cast iron block too. Don’t know what the advantage of a cylinder forcing gas is. That pipe is long that comes off the dummy cylinder. My 3hp Briggs would probably beat it in a race and it’s governed and has a large rear sprocket. That rpm sounds as if it was barely running maybe 450rpm. If you can engineer one of these properly I’m sure it would be worth it if the thing was free. I wonder why he didn’t attempt to use both cylinders for power? Unless the pistons are at different positions than a 4 stroke vtwin. With a 49cc or even lower displacement engine 22mph can be reached and those are much lighter. What would be cool is if someone made a 79cc engine into a vtwin.