Ski-Doo FORMULA S 1997, Shop Manual

Page: 425 / 926

Section 03 ENGINE
Sub-Section 11 (CARBURETOR AND FUEL PUMP)
03-11-6
CARBURETOR ADJUSTMENTS
1. Idle speed screw
2. Air screw
6, Air Screw Adjustment
Completely close the air screw (until a slight seat-
ing resistance is felt) then back off as specified.
Turning screw in clockwise enrichners mixture
and conversely, turning it out counterclockwise
leans mixture.
Refer to TECHNICAL DATA 09 for the specifica-
tions.
Carburetor Synchronization
Twin Carburetor Models Only
Both carburetor slides must start to open at the
same time.
Completely unscrew idle speed screw on both
carburetors.
Unlock cable adjustment lock nut then screw in
adjuster until throttle slide bottoms out. Proceed
the same for both carburetors.
Unscrew cable adjuster to eliminate all cable play
but without raising throttle slide. Proceed with
care on both carburetors then tighten jam nuts.
Both carburetor slide must start to open at the
same time, depress throttle lever to check it and
turn cable adjuster as required.
Check throttle slide position at wide open throttle.
Throttle slide must be flush or 1 mm (.040 in) low-
er than carburetor
outlet bore. At that same posi-
tion, check that throttle slide does not contact
carburetor cover. Turn cable adjuster and recheck
synchronization.
TYPICAL
1. Screw in and out until no cable free play exists
2. Check that throttle side does not move
3. Idle speed screw completely unscrewed
Throttle Slide Adjustment
All Models
For maximum performance, correct carburetor
throttle slide adjustment is critical.
The following method should be used with engine
turned off:
– Idle speed screw must be completely un-
screwed. It must not contact throttle slide.
Turn the idle speed screw clockwise until it con-
tacts the throttle slide then continue turning 2 ad-
ditional turns.
A02C09A
2
1
-
CAUTION
If the throttle slide rests against the carbure-
tor cover at full throttle opening, this will
create too much strain and may damage the
throttle cable or other components in throt-
tle mechanism.
◆
WARNING
Ensure the engine is turned OFF, prior to per-
forming the throttle slide adjustment
3
1
2
A01C33A