Polaris 2011 Ranger 400 - Manual (Page 79)

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MAINTENANCE
Carburetor
The idle speed adjustment should be performed as outlined in the Peri-
odic Maintenance Chart, or whenever the idle speed is changed. Recom-
mended engine idle RPM is 1200 +/- 200.
Carburetor/Engine Idle RPM Adjustment
If the engine idle speed is unsatisfactory and all other conditions are
favorable, the carburetor can be adjusted.
1. Apply the brakes.
2. Place the transmission in PARK.
3. Start the engine and allow it to warm
up for approximately five minutes.
4. Remove the seat. Locate the idle adjust
screw.
5. Place the transmission in gear.
6. Turn the screw in (clockwise) to raise
RPM. Turn the screw out (counter-
clockwise) to lower RPM.
Idle Adjust Screw