And now; and now, Voyager: I shall share with you my perception of the CVK carburetor's ENRICHER design and function. (PEER REVIEW: Corrections, contradictions always welcomed!)
O.K. A PLUNGER seals a raw fuel orifice in the carburetor, when "OFF." When the enricher is activated ("ON,"), the plunger is withdrawn from the orifice, enabling raw fuel to flow into the carburetor.
ALSO, and very importantly, when the enricher plunger is withdrawn, an AIR PASSAGE simultaneously opens.
The raw fuel from the enricher fuel orifice and the air from the air passage MIXES, providing a fuel-rich mixture to the carburetor venturi for ease in starting.
THUS; the starting enricher on your KLR650 exists as a sort of, MINI-CARBURETOR
, independently mixing air and fuel upon activation.
A small detail: The CVK carburetor enricher is NOT a "choke," as referred to by many. A choke restricts air flow into a carburetor (as with an occluding butterfly valve), creating a fuel-rich mixture. Yet, the KLR starting enricher is referred to as the "choke" even by cognoscenti, even in service manuals.
And then, besides the starting enricher discussed above, there's the COASTING ENRICHER/air cut valve/backfire preventer; but . . . that's another story!
Then, as some say, "A picture is worth . . . "; aw, I forget the rest!
(The DESCENDING arrows indicated air flow; the HORIZONTAL little dots and stuff represent FUEL, to the best of my knowledge and belief.)