Ski-Doo Formula S 1998, Shop Manual

Page: 134 / 338

Section 04 ENGINE
Subsection 09 (CARBURETOR AND FUEL PUMP)
04-09-5
NOTE: Do not obstruct hole in throttle slide when
installing needle retaining plate. This is important
to allow air escaping through and thus allowing a
quick response.
CENTER POST TYPE
1. Throttle cable
2. Needle retaining plate
3. Throttle slide
Make sure the nylon packing no. 4 is installed on
all applicable throttle slides.
CENTER POST TYPE
1. E-clip
2. Needle retaining plate
3. Screw
4. Needle
5. Nylon packing
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 10 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 slides 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.
-
CAUTION
Serious engine damage can occur if this no-
tice is disregarded.
A00C1TA
1
2
3
2
3
4
5
1
A00C3MA
A02C09A
2
1