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John,I recently had some rings for the 550 from silvers.The rings are slightly different if you look at them one is square and the other slightly tapered.It tells you the installation sequence in the manual if you have one, the rings are marked with a "N" this needs to go to the top if I remember correctly.Hope this helps.Regards,
Thats not detanation as the cause, what happens is some idiot PO reved the nuts off it when cold and the rings expand to quickly so the top one shatters into pieces, this widens the ring groove then flame passage and heat finish it off.Used to happen quite a bit on 250K4 and CB175's
I had exactly this on a 550 years ago. My friend bought a bike that had been standing for a year or so. Unfortunatley, the seller had taken the bike for a blast to make sure all working OK. My friend bought the bike but soon complained that it wasn't running properly and was smoking. When I investigated I discovered that there were broken rings on all four cylinders. Luckily, they had stayed in place and not scored the bore and a new set was all that was needed.