Oil leak at crankshaft behind starter clutch

Is there enough sticking out to weld a nut to? It shouldn’t be that tight now there is no pressure on it 

I dont know how well an easy-out bit would work on that. Maybe you could tap new threads on the inside of the bolt the tighten down another bolt and loosen it that way. This is all if you dont have a welder.

Normally I would use a left hand drill bit to remove but since it's left hand threads use a regular drill bit to remove the stub.

 Just a final verification on the “is this area dry or wet?” question. Here is a photo with side cover, dynamo and starter gear removed. There are two seals. One seals between the crank case and starter gear. The other seals between the starter gear and crankshaft. I will be replacing both. I believe the outer gasket is just to keep water out.