OK, just for you I took the time to take a couple of photos of one of my YS engines that had a crack in the case, it's a 1.20 FZ. A YS is fuel injected and must be 100% sealed, it operates with pressure. The crank case was drilled out then tapped then a screw was installed where the crack was located. Then it had to be machined inside flush with the case so the crank and rod wouldn't hit it, very tight fit!! On the outside it looks like hell due to the JB weld slathered over the repair. It is just to make sure the screw doesn't come out. Just an after thought. The engine runs perfectly. Inside the machine shop did such a good job you really have to look clos to even see the repair.
A YS is/was a very high dollar work of art and worth repairing. Depending on how you feel about the Enya it can be repaired, a new case can be bought or you can find an even better engine for not much money at most any RC swap meets.
I'm presently looking for a new case/head for another YS I have, a 110 that I had fully rebuilt then crashed on the first flight and broke the cylinder where the header threads in. The engine is well worth repairing, I can either buy a new part or find a used one, my call. I don't need the engine for a while so I will look for the used part but for under 100 bucks I can get a new one.