OK, it threw a rod… A few possible reasons for this. The first reason might be that a light oil mix was used. These engines are designed to use a 16:1 fuel/oil mix, and it is a must for those plain rod bearings. Ignore the hype about “today’s oils are better so less is required”. Go light on the oil mix, and this is what happens. Another cause for this is a slow silent killer. The lower crankcase seal is a very complicated assembly that is often ignored/left out/mis assembled allowing water to enter the crankcase slowly wearing the rod bearing.
In this case, it seems hard to believe that the crankshaft is in good shape, I would reinspect it for sure. The other issue is hidden damage to the inside of the crankcase. When parts go flying around inside, usually the crankcase gets cracked/damaged creating an external leak.
