Hey Bob I'm looking at one on my table almost exactly the same except for brass cylinder and flywheels. I got two pops out of mine.
I don't know why they put those oiler cups on them with a graphite piston but you don't oil that kind. You use powder graphite.
I'm thinking that's the problem with mine from the person before me. It's a graphite piston and they oiled it. It's coming apart and
getting a good cleaning. Good luck with your's, if I get this one running, I'll let you know.