RE: Any body know what this plane is worth???
Don't ask the guy if the stuff works - make him prove it.
Start the engine and see how it runs.
Have him bring it to the field so someone there can check it out.
If he doesn't want to then be very apprehensive.
If you are just a beginner you probably don't know what to look for.
I've been at it for 5 years now and still would want a second set of eyes I trust when looking at used gear.
Good Luck,
KW_Counter