Air Screw Adjustment - 2-Stroke Models; Pilot Screw (Idle Mixture) Adjustment - 4-Stroke Models - Polaris Magnum 2x4 Service Manual

Air Screw Adjustment
2-Stroke Models
1. Turn carburetor air screw in until lightly seated. Back
screw out the specified number of turns.
2.
Warm up the engine to operating temperature.
3. Set idle speed to 600-800 RPM.
NOTE: Adjusting the air screw may affect idle speed.
Always check throttle cable freeplay after adjusting idle
speed and adjust if necessary.
4. Turn the screw in (to richen) or out (to lean) the
mixture. Adjust air screw for best throttle response
and smooth idle.
5. Re-adjust idle if necessary.
Pilot Screw (Idle Mixture) Adjustment
4-Stroke Models
NOTE: The pilot screw is pre-set at the factory. The fol-
lowing adjustment procedure should be used after disas-
sembly and cleaning or
if
the pilot screw is replaced. Be
sure all engine maintenance items have been performed
and are within specifications before adjusting pilot screw.
1. Turn pilot screw in (clockwise) until lightly seated.
Turn screw out the specified number of turns.
2. Start engine and warm it up to operating temperature
(about 10 minutes).
3, Connect an accurate tachometer that will read in
increments of
+
or - 50 RPM.
4. Set idle speed to 1200 RPM. Always check throttle
cable freeplay after adjusting idle speed and adjust if
necessary.
5. Slowly turn mixture screw clockwise until RPM begins
to decrease by 50 RPM or greater.
5/98
2.12a
MAINTENANCE
Carburetor Adjustments
250/300/400cc Engines
Air Screw
425/500 Engines
FRONT
(Enginy
Pilot Screw
Polaris Industries Inc.