Pilot Screw Adjustment; Idle Speed - Polaris Sportsman 400 Service Manual

MAINTENANCE

PILOT SCREW ADJUSTMENT

Pilot Screw (Idle Mixture) Adjustment Notes
Do not tighten the pilot screw forcefully against the seat or the screw and/or seat will be permanently damaged.
Start engine and warm it up to operating temperature (about 10 minutes). This is a very important step.
1. Turn pilot screw in (clockwise) until lightly seated.
Turn screw out the specified number of turns.
Pilot Screw Adjustment:
2.0 Turns
2. Connect an accurate tachometer that will read in
increments of + or -- 50 RPM such as the PET
2100DX (P/N 8712100DX) or the PET 2500 (P/N
8712500).
3. Set idle speed to 1200 RPM. Always check throttle
cable freeplay after adjusting idle speed and adjust if
necessary.
4. Slowly turn mixture screw clockwise using the pilot
screw wrench until RPM begins to decrease by 50
RPM or greater.
5. Slowly turn mixture screw counterclockwise until idle
speed increases to maximum RPM. Continue turning
counterclockwise until idle RPM begins to drop.
6. Center the pilot screw between the points in step 5
and 6.
7. Re adjust idle speed if not within specification.
IDLE SPEED ADJUSTMENT
1. Start engine and warm it up thoroughly.
2. Adjust idle speed by turning the idle adjustment screw
in (clockwise) to increase or out (counterclockwise) to
decrease RPM. (Refer to Ill. at right).
NOTE: Adjusting the idle speed affects throttle cable
freeplay and electronic throttle control (ETC) adjustment.
Always check throttle cable freeplay after adjusting idle
speed and adjust if necessary.

Idle Speed:

1200 +/- - 200 RPM
2.14
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FRONT
(Engine)
CV Carburetor
Pilot Screw
Idle Screw