60cc engines have not been used regularly in karting for the last 4 years or so. A modified KX-60 would have never been legal to race.
So…. if it was bolted to a kart, I think you might have a shot at selling it… but I’m guessing it’s fairly unlikely that just the engine alone will sell, particularly since it’s still set up in dirt bike trim (kickstarter still attached, etc.)
But hey, throw it up for sale and see what happens.