Easiest way to tell is the venturi.
The MC18 and MC21 is U shaped, and the MC28 is round. U or O, 18/21 or 28!
Jet kits for both types are significantly different. MC21 kit will fit an MC18 (and MC16 to a degree) but MC28 only fits MC28.
Technical Resources: Standard carb settings
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Andy.
NSR-WORLD.COM
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