I have a 20hp Kohler engine. How much could i get for sellling it?

The engine is a kohler command V-Twin and came out of a yard man tractor. It was removed with just a shade under 200 hours on the clock. It ran 3 months before being pulled, and was salvaged due to trans issues on the tractor. It would be appreciated if someone could give me a rough price on how much i could sell it for. Thanks!|||Check Ebay to see what motors similiar to yours are bringing. Can someone hear it run. If not, you will have a hard time getting anything out of it.