The clutch that does not go on the engine crankshaft I am curious about. I can see alignment is solved with the jackshaft/clutch arrangement if you call it that, but one question I have to ask.
My bike I got another engine that is newer an 1/2 hp more to swap in, but I have a problem. I was thinking of possibly using a different engine that has too short a crankshaft for the belt clutch I have. I have looked to buy used crankshaft to fit, but very difficult to find cheap and get all the right spec to match.
So the other route was to look sort of like what you have. The pulley on the engine crank uses the 1.3 inch length no problem. So here is what I thought I'd try. I put the belt clutch on the jackshaft. Then I realized that the type of clutch uses a live (moving) crankshaft or in this case live jackshaft.
I could do this, but finding room to place another pulley on the jackshaft and also the belt clutch too, I would have to change stuff around to make room.
How is this clutch you use have all in one; a way for pulley as input and pulley as output? Is it on a static (non-moving) jackshaft?
Oh and yea looks like a powerful beast your and friends build!
My time before last outing with the 3hp Briggs Bike (maybe to be 3.5).