2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 124Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 124

CARBURATION AND FUEL SYSTEM Pilot (Idle and Slow) System This system supplies fuel during engine operation with throttle
in the venturiConsequently the vacuum slide (2) moves upwardThe fuel in float chamber (3) is metered by main jet (4), and
the metered fuel enters needle jet (5), in which it mixes with the air admitted through main air jet (6) to form an emulsionThe
emulsified fuel then passes through the clearance between needle jet (5) and jet needle (7), and is discharged into the venturi
(A)Mixture proportioning is accomplished in needle jet (5); the clearance through which the emulsified fuel must flow is
determined ultimately by throttle position and vacuum slide height 99234122012 Sportsman 400500 and EFI Tractor Service Manual