Cylinder bores look about the same.
Looked around for an engine, in fact I'm still looking. Frustrating doesn't begin to describe the process.
As for the crank, even if I get another one I'll have it rebuilt. Bore Tech was recommended for the cylinders by Lyn Garland who gets high praise over on the 2-Stroke World site. Still waiting to hear back from them.
Thanks for the suggestions on the pistons and autoluber (currently disconnected).