MAINTENANCE
2.12
CHOKE (ENRICHER)
ADJUSTMENT
Boot
If the choke knob does not stay out when pulled,
adjust the choke tension by tightening (clockwise) the
jam nut 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.
PILOT SCREW ADJUSTMENT
Pilot Screw
FRONT
(Engine)
1. Start engine and warm it up to operating
temperature (about 10 minutes).
2. 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.
Pilot Screw Adjustment:
Sportsman 400 -- 2 3/4 Turn Out
Sportsman 500 -- 2 Turns Out
3. 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).
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 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.
IDLE SPEED ADJUSTMENT
Idle Screw
CV Carburetor
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
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