Uh oh that doesn't sound good. If you take off the caps so you can see where you can check the valve clearance - then you can see if the valves are moving I suppose. The bikes engine would have had to be severely beat on in order to hurt it. They are so tough you would have to purposely take the oil out of it and run it to damage it.
I think the thing you said you broke is just the round cover that screws on and off to get to the valve train right? That won't have any effect on compression. It just keeps the oil in the engine and the dirt out. I wonder if maybe someone ran it without the air filter on and got some dirt or something into the engine causing damage. If the engine sat fro years and years there might be some rust inside but if it's turning over freely it probably is ok and not so bad. I wish I could give it a look up close for ya!
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