2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 173Get this manual
Fuel System: Main System As the throttle valve (1) is opened, engine speed rises and negative pressure in the venturi "A"
emulsified fuel then passes through the clearance between the needle jet (5) and jet needle (7) and is discharged into the
venturi "A", where it meets the main air stream being drawn by the engineMixture proportioning is accomplished in the needle
jet (5)The clearance through which the emulsified fuel must flow ultimately depends on throttle position I827H1170037-02