1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 127Get this manual
FUEL SYSTEMCARBURETION Mixture Screw SettingsKeihin Idle Speed
1Connect tachometer according manufacturer's instructionsto the
With craft in the water or test tank, start engine and let it idleAdjust idle speed to specifications by turning the idle speed screw in (clockwise) to increase or out (counterclockwise) to decrease idle speedCheck throttle cable free play and oil pump adjustment and adjust if necessary4
Idle Speed Screw
Mixture Screw AdjustmentBase Setting
The high speed and 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 mixture, the carburetors, fuel systemand 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 recordeduse the following procedure to adjust each screwNote:The base settings are for elevations between sea level and 3000 ft(900 meters)