Thanks for the info and links guys!
I wonder what the "five speed conversion" is the seller is talking about in the ad? Anyone done this, or know any links to information on it?
By the way, the layshaft in the box with the floating bolt is also cracked. Its starts near the key where a shaft will normally crack, but how do you manage that on a motorcycle with barely more horsepower than a riding lawn mower!
Those internals I no longer trust at all, but the case is the good one. At least I spotted that before I sent it out for grind, I know damn well those guys would have ground it first then told me it was cracked.