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Welcome back zman!

In the meantime you can tell if a valve is bent by pulling the valve covers off and rotating engine to closed position on each valve rocker. A bent valve will have excessive clearance.

Cranking with 30 old belts is a gamble of breaking. At least I’d pull off the belt covers and inspect best I can. Twist each belt, try to judge its flexibility.

Great pics William.

Yeah ain’t that the truth! Thanks a lot Biden!

Maybe ask Randakk for a rebuilder? He’s a member here. Seems like there is at least one other guy rebuilding them.

This video at about 11:25 he shows the hole

Sorry, can't help you there and the manuals don't help. Someone else have an idea where to look?

There is a tiny return/relief hole in the master cylinder. It sounds like that is getting blocked. A good flushing might take care of it.

Sounds to me more like a low rpm circuit plugged in the carbs.

Actually the Clymer manual shows 1980 forward having a shim on the rear caliper. Evidently they work fine without them, I don't have any in the front either. 1975-1983ClymerManual Page 259

Barely 24,000 miles on it. A lot of miles left in that one.

Good looking bike you got there!

I never had a shim on the rear.

That's some nasty stuff right there. Amazing some things still work as bad as they can get.

Nice blue and pinstripe.

Nice murals!

Beautiful!

How the valves look on that head?

If it’s been turned over without belts then likely bent valves. I suppose you could put the belts on with the timing set and kick it over to check compression. Might get lucky and only one cylinder low but both heads likely need removed.