Those carburetors are available in choke and non choke models, your
carburetor is a non choke model and one can not be added. Before you
start your quad, twist the throttle a couple times to prime the
cylinders and then press the start button.
So there is no choke.
Is this why it looks like there is no 3rd pilot hole?
Depends on your elevation, but both seem a little big. Definitely wouldn’t go any bigger. Bounce it off the jetting database and it should get you close. The other 2 are probably the leak jet and air jet. Shouldn’t need to change them.
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