Throttle Operation / Air Screw Adjustment; Idle Speed Adjustment - Polaris 2003 Scrambler 50 Service Manual

GENERAL INFORMATION
To change lubricant:
1. Place a drain pan beneath the transmission
lubricant drain plug area.
2. Remove the drain plug and wipe the magnetic end
clean to remove accumulated metallic filings.
3. After the lubricant has drained completely, install a
new sealing washer and install the drain plug.
Torque to 14 ft. lbs. (19.3 Nm).
4. Add the proper lubricant through the fill plug hole. Do
not overfill. An indication of over filling is lubricant
leaking from the vent hose after operation.
5. Check for leaks. Discard used lubricant properly.
THROTTLE OPERATION
Check for smooth throttle opening and closing.
Throttle lever operation should be smooth and lever
must return freely without binding.
1. Start the engine and let it idle.
2. Turn handlebars from full right to full left. If idle
speed increases at any point in the turning range,
inspect throttle cable routing and condition.
3. Replace the throttle cable if worn, kinked, or
damaged.
AIR SCREW ADJUSTMENT
1. Turn carburetor air screw in (clockwise) until lightly
seated. Back screw out the specified number of
turns.
2. Warm up the engine to operating temperature
Vent Hose
3. Set idle speed to 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
5. Re-adjust idle speed if necessary.
Drain Plug

IDLE SPEED ADJUSTMENT

1. Start engine and warm it up thoroughly.
2. Adjust idle speed by turning the idle adjustment
NOTE: Adjusting the idle speed affects throttle cable
freeplay and electronic throttle control (ETC)
adjustment.
after adjusting idle speed and adjust if necessary.
Air Screw
Air Screw Adjustment:
50 cc: 1/2 Turn Out from Lightly Seated
90 cc: 1 Turn Out from Lightly Seated
(about 10 minutes).
mixture. Adjust air screw for best throttle
response and smooth idle.
Throttle Set Screw
screw in (clockwise) to increase or out
(counterclockwise) to decrease RPM.
Idle Speed:
800 ± 200 RPM
Always check throttle cable freeplay
1.15