Selling an Evolution 80gx. I had this in a model back in 2011 and during a flight, the high speed needle vibrated out. The engine was purchased used and I am the 2nd owner.
Over the years, I've had a few Evolution engines and they ran well. The issue is that since this particular engine isn't supported, you'll need to go to eBay or MVVS for parts. I'm sure other sources exist.
I would recommend replacing the carburetor. It is missing the high speed needle and could benefit from having all gaskets and internals replaced. Ignition is included but has a cut ground wire. I've seen these engines sell used for $425. Since a carburetor and muffler are needed, my cost reflects that. E-mail me at email@example.com with questions or additional photos.