Went down to the hardware store and got a hitch pin. Perfect diameter and seems strong enough. It was a bit too long so I bent it over like a cotter pin.
Getting closer.
That weight is JUST the cases and bottom end internals. Lightened crank, rods, main/counter shafts, shift drum, shift forks, primary shaft, starter clutch. No alternator, points, clutch, shift mechanism, etc. I'll get a final dry weight with the starter once I get it all together.
Next hangup is the shifter mechanism. I'm not sure if I have all the parts. This is what I have, it's laid out roughly how it would be installed:
This is what someone posted on the forum at some point. It's a 550, but the mechanism looks different.
The only noticeable difference is there isn't a second spring on the right side. Is it just a later design? My parts are from my 74.
Oh, and nothing goes into the threads of the shaft that holds the shift forks, right (visible behind the left side of the top bearing retainer)?
And another question: My powdercoater didn't mask off a few gasket surfaces, most notably the clutch cover mating surface on the case, and the oil pan mating surface on the oil pan side. Should I sand down the powdercoating on all gasket surfaces?