1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 101Get this manual
FUEL SYSTEMCARBURETION Carburetor Adjustment and ServiceMikuni Manual Carb Synchronization Mikuni ContNOTE: To simplify this procedure we will refer to the carburetor with the idle adjustment screw as #1, the center as #2, and the side opposite the idle screw as #31Turn idle screw out until #1 cylinder throttle plate is closed completelyIt may be necessary to open the #2 and #3 throttle plates slightly with synchronizing screws to allow the #1 throttle plate to close completelyTo verify proper sync, observe all plates and back idle screw outAll plates should close at the same timeTurn idle adjuster screw in while observing bypass portTurn screw in until port appears at edge of plate on #1 carburetorAdjust center throttle plate to the same position as #1 plate using synchronizing screw (A)3 (Q