Thanks for the synopsis Adrian,
I removed my E-start solenoid when it crapped out years ago, and I only use kick start now. Haven't removed the sprag but I think it's still intact. In any case, I haven't found toothy metal bits in my primary case, etc.
I left the useless decompresser on, but I don't use it.
I've thrown a pushrod twice in the life of the bike, and now have fitted the performance tappet lifter cups. I don't think that eliminates the brittleness of the thin adjuster things though, so I'll keep an eye on that.
If I understand your response correctly, the Big End is a weak part in all carbed AVL's, which includes my '09 model in the US. When it goes, is that likely to immediately seize up your engine, or is it just a clump clump clump loss of power?