K&B model airplane engine #5680 D-97 .28 R/C SportsterMade in the USA. Looks to be used but in good shape.

The engine turns over by hand and has good compression. I've sold multiple engines from this collection that was owned by an extreme rc enthusiast on the cover of atleast 1 rc magazine and haven't had any reports of any engine issues so I dont expect these to be any different, I would reccomend normal maintanace  as you would do on any new engine before firing up. Tune up, old oil used to keep parts protected cleaned up etc.

Comes with the parts pictured

I'm definitely not an expert on these, but would be happy to help verify or take more pictures to make sure this is exactly what you expect!