Crank case welding.

[b1k3rdude]

@Dave, that looks like less of a crack and more of a extreme wear..? Regarding getting it welded, all you need to find is a good mechanic/welder that can do fine TIG welding on aluminium/alloy. Or even better find someone who can do do laser welding, I got a float bowl done this way and it was the most impressive piece of welding I have ever seen.