yes, the "main jet holder" aka emulsion tube....you need to assure the holes (if present) are clear
the needle jet (commonly known as a "collar") resides underneath, be certain it is present and clear, its visible looking into the venturi note it only fits in 1 direction.
you removed the needle? Checked taper for corrosion or debris?
Did you leave any components loose? Assemble anything incorrectly?
Its bogging ALL THE WAY from 6 to 10K?
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