Edit 17/8: I've given up on selling this on eBay due to a buyer who never paid and noone bidding when I relisted it, so anyone who'll take it away can have it for nothing but you'll need to come and pick it up from Milton near Cambridge.
I swapped this engine out years ago (with a lot of help from Gordo) when the output shaft bearings went and, because it's an engine-split job, it was cheaper to replace it than get it fixed. Since then it's been sitting in my garage with a plastic garbage bag over it so it should still be in good nick. I kept it well sprayed with Scottoiler FS365 when it was in the bike and the garage is bone dry.
It had exactly 62,597 miles on it when it was taken out and, to be honest, it ran better and looked better than the new engine did.