Polaris Trail Boss 330 2003 Service Manual page 27

THROTTLE OPERATION - ALL
MODELS
Check for smooth throttle opening and closing in all
handlebar positions. Throttle lever operation should
be smooth and lever must return freely without
binding.
1. Place the gear selector in neutral.
2. Set parking brake.
3. Start the engine and let it idle.
4. 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. If
cable is routed properly and in good condition,
repeat adjustment procedure.
5. Replace the throttle cable if worn, kinked, or
damaged.
CHOKE (ENRICHER)
ADJUSTMENT
Boot
If the choke knob does not stay out when pulled,
adjust the choke tension by tightening the tensioner
located under the rubber boot between the choke
knob and nut. Firmly grasp the rubber boot and
tighten until the choke slides freely but stays out when
pulled.
Verify free play of 1/16--3/16" (1.6--4.76 mm) and
smooth operation of choke cable.
If smooth choke operation is not obtainable, inspect
choke cable for kinks or sharp bends in routing.
2.10
PILOT SCREW (IDLE
MIXTURE) ADJUSTMENT
NOTE: These procedures are intended as reference
only. Actual final settings may be different depending
on the atmospheric conditions in your area.
1. Turn pilot screw in (clockwise) until lightly seated.
Turn screw out the specified number of turns.
NOTE: Do not tighten the pilot screw forcefully
against the seat or the screw and/or seat will be
permanently damaged.
FRONT
(Engine)
Pilot Screw
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 (PN 8712100DX) or the PET 2500 (PN
8712500).
3. Start engine and warm it up to operating
temperature (about 10 minutes).
4. Set idle speed to 1300 RPM.
throttle cable freeplay after adjusting idle speed
and adjust if necessary.
5. Slowly turn mixture screw clockwise using the
pilot screw wrench until engine begins to miss.
6. Slowly turn mixture screw counterclockwise until
idle speed increases to maximum RPM.
Continue turning counterclockwise until idle RPM
begins to drop.
7. Center the pilot screw between the points in Step
5 and 6.
8. Re adjust idle speed if not within specification.
MAINTENANCE
Always check