There are actually three versions of the crankcase now. The original like mine was that broke. The one with the beefed up socket and breather housing that Ian (Dog) is talking about (which they put as a replacement on my bike). The newer models have a totally re-designed breather and don't use the rotary breather that was in the first two generations.
The first casing has the potential for starter failure. The first two have the potential for rotary breather/seal failure like mine has now. They will replace the breather and seal, but the bike can not be converted to the new style that's improved further.
