Hello dynamite, and welcome to the forum.

I don't have any data for the MC11 I'm afraid, but my (non)educated guess would be that I expect the B8ES plug (or more likely a B9ES probably) would be the correct one, and should be the same in both cylinders under 99% of cases.

Possibly the same plug required as the NS400R: BR8ES or BR9ES (gap 0.7~0.8mm).
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Andy.
NSR-WORLD.COM

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