2001 Polaris SLH, Virage PWC Factory Service Manual, Page 146Get this manual
CarburetionExhaust Idle Speed Adjustment
1Connect tachometer according manufacturer's instructionsto the
2With craft in the water or test tank, start engine and let it idle 3Adjust idle speed to specifications by turning the idle speed screw in (clockwise) to increase or out (counterclockwise) to decrease idle speed Check throttle cable free play and oil pump adjustment and adjust if necessaryIdle Speed (in water) 1350 100 RPM
Mixture Screw AdjustmentBase SettingKeihin
CAUTION: I
The low speed (idle) mixture screw base settings are determined at the factory using flow meterLimiter caps are then installed to allow only slight adjustment of the screws in each direction to compensate for changes in altitude and temperatureThe base settings should not be changedIf large adjustments are necessary for proper mixturethe carburetors, fuel system, and engine should be inspected to find the cause of rich or lean condition (See Lean Condition Troubleshooting in Maintenance section If the carburetor has been tampered with or disassembled before exact base settings were recorded, use the following procedure to adjust each screwNote:The base settings are for elevations between sea level and 3000 ft (900 meters) 12Remove limiter cap(s) Turn mixture screw in until lightly seated, then turn screw out the specified number of turns (see specifications in beginning of this chapter)Reinstall limiter cap(s) with tab positioned mid-way between the stops to allow slight adjustment in each directionTest the craft under actual operating conditions to verify proper mixture