I agree with Little Ed. The point is, and it was missed by a few of you, that some of us NC owners are experiencing the odd pulsation and some are not (I am.) If it was normal, all would be experiencing it. There appears to be a common problem and it needs further investigation. I am monitoring this thread with great interest and hope a solution can be found.
This may be so. The issue is so subtle on mine that I hardly notice it and it certainly does not bother me. That leaves open the options that:
1) My bike doesn't have the "problem"
2) I have lower expectations of "smoothness"
So we are dealing either with a problem that only some bikes have (as you say), or an issue that is common to all the bikes but only some of us view as abnormal. It is not clear to me whether I have the "problem" or not. But after riding old clackity airhead BMW's for so long that shudder and shake like an old horse, it may be that my expectations are too low.