1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 100Get this manual
FUEL SYSTEMCARBURETION Carburetor Adjustment and ServiceMikuni Carburetor SynchronizationPro 785
2Install tachometer to one of spark plug high tension leadsAdjust idle speed to approximately 1300-1400 RPM using idle speed adjustment screw located near throttle cable mounting
Start the engine and let it idleSynchronize center and mag carburetors to PTO carburetor by adjusting throttle plate screws in or outWhen carburetors are correctly synchronized all mercury columns or vacuum gauges will be equalCheck idle speed and throttle lever freeplay and adjust if necessary