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Welcome to the forum! IMO, you've come too far to not do the whole job. As Kurt mentioned, how does the cross-hatching look? If it's good, I'd as least "break" the glaze.Rebuilding 1977 R100S, changing piston rings. Is cylinder honing necessary?
I'm under the impression that new rings should be introduced to honed cylinders in order for them to develop their seal. I 'm planning on honing my nikasil cylinders this winter before installing new piston rings.
Jim
I'm amazed at how many people out there have calibrated eyes! You can look at something and come to the conclusion that everything is just fine. The OP stated that the cylinders were on a 77 model so they must be iron lined.
This also reminds me of a dealer I worked for who would run his fingers through the bore and declare that all that was needed was a quick hone with a "bottle brush" hone and a new set of rings. Calibrated fingers!
The repair manual (BMW) provides us with the specs for the bore, taper and out of roundness. So if you have any questions then you might want to find someone who can actually measure these dimensions. Only after that, can you make a decision of what to do. Any real "mechanic" will tell you this. So if you want a half-as** job, take it to a half as** mechanic!