The only snapped chain I have ever seen in person was on a KTM. The dealer had changed it about 500 miles before, so maybe they are a PITA to fit correctly?
F650 chains fail very quickly once they start to go. It's because BMW or Aprillia took a chain meant for a 250 twin and used it on a 650 single.
The difference with the MZ enclosed chain and a lot of the others is that it was designed on, not bodged together afterwards. If you don't get the tubes in the engine case grooves it fails. Assemble correctly once, leave it alone and it'll work for years. I'm surprised no one has designed a bike specific add on though. Modern adhesives should make it possible at add something like the MZ grooves to the back of any case.
Andy
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