Odds are he's using a servi-car tranny w/reverse and a servi-car axle (chain drive). That's a 45" Harley, so only about 25hp stock - not quite a lightning performer, but it would be fun. I've seen pics of this creation elsewhere years ago...probably on the old HD Flathead forum run by flathead power (now S&S, I think).
In this case I think I see the chain going just to the LR wheel, no diff. I hadn't thought about reverse, that's a potentially tough thing to come up with on most motorcycle engines.
But the servi-car had reverse - at least some of them did. The reverse gear was also fitted to some 45s with a side car - or so I'm told - probably just a servi-car adaption! The servi-car rear was chain drive - I suppose it could be fabricated (one side shortened, other side lengthened) offset for use here. It would then have brakes too. It would be the easiest adaptation.
Rick Yacoucci's V8 two liter Suzuki. Two 1000s on a common plate to be sort of a V8. He went 360 with one Suzuki. 309 with a flathead Ford. Looking for 400.
I know, the thread is two years old The first Hondas, The 600s, did not have motorcycle engines. They were 600cc fan cooled engines with a reverse gear, differential and H pattern shifter. I rebuilt dozens of them and there were no parts that interchanged with any Honda bike
A guy in my town has a Russian car shell . It was powered by a single cylinder 2- stroke engine. I would post a pic but he is a hoarder and it is buried in the back of his shop.
Thought I would ad a couple of photos to this thread. A friend recently acquired the little racer in the attached photos. He would like to know more about its origins. What he has been told about the car is that it was manufactured in Ohio. It is powered by a German (not Rotax) 2 stoke, twin cylinder. It is suppose to be very quick. Anyone seen such before?