Andrew SXL-925: Perfect, except for restarting... Super-2: Excellent; current go-to saw! 20av: Newer saw, excellent emergency backup saw! XL2: (in limbo) I have no idea what to do with it now (non-Homelite) Mac 10-10A: down, needs crank seals...
In my experience what kills those saws is sucking the dust from cutting in. Usually either due to faulty or lack of an air filter. I would't be surprised if the bottom end was not far behind the rest of the saw, then there's the possibility of damage to the case, running a saw to the point of pretty much eliminating the compression is hard on nearly every component. It almost makes me wonder how they kept running it until it had only 20lbs of compression?
I would't risk it without being able to inspect it in person but thats just me. Looks like a cool project but worried you may be chasing your tail too long trying to get it running.
Chainsaws: Super 2 (3), CS-40 20", Super EZ Auto 16", XL-12 20", XL-AO 20", Super XL-AO 20", XL-500 24", 330 20", C-91 27", 5-30N 30", 707-G 36"
I'm not sure how a saw could get to a 20psi without the seals and rings being completely gone, they wont even start much below 90psi. I did have the same thing happen to me when I tested four saws, all came out as a little over 20psi, until I put the adapter on the end of the compression tester that allows for a reading.