TuckerBag wrote:
Also, for what its worth, the MC16/18's have hexagonal shaped barrels/heads, the MC21/28 has round barrels/heads.

Pretty good summary, except the barrels (c/w heads) are interchangeable across all models, so it's not that uncommon these days to see MC21s with hexagonal barrels, or earlier bikes with the later round barrels... especially in locations where NSR parts aren't very common or easy to source.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!