Moto GP Propulsion

ABOVE: The sprocket is up high, is that for the rear wheel?  How can a tiny gear like that get you 175mph?  It's a two-stroke, so it can't be for overhead cams.  Different sized expansion chambers?  Carbs in the front.

. . . an understanding(or lack of thereof).  The power supply in the highest form of motorcycle road racing.  I feel like a simpleton. 

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