Ski-Doo FORMULA III, Shop Manual

Page: 164 / 356

Section 04 ENGINE
Sub-Section 11 (CARBURETOR AND FUEL PUMP)
04-11-8
Carburetor Synchronization
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.
1. Screw in and out until no cable free play exists
2. Check that throttle slide does not move
3. Idle speed screw completely unscrewed
Check throttle slide position at wide open throttle.
On liquid cooled models, throttle slide must be
flush with carburetor
outlet bore. On fan cooled
models, throttle slide must be flush with carbure-
tor
inlet bore. At that same position, check that
throttle slide does not contact carburetor cover.
Turn cable adjuster and recheck synchronisation.
CA UTION : If the throttle slide rests
against the carburetor cover at full throt-
tle opening, this will create too much strain
and may damage the throttle cable or other
components in throttle mechanism.
Throttle Slide Adjustment
CAUTION : Ensure the engine is turned
OFF, prior to performing the throttle slide
adjustment.
For maximum performance, correct carburetor
throttle slide adjustment is critical.
The following method should be used with engine
turned off :
Unscrew idle screw until it does not contact throt-
tle slide.
Turn the idle speed screw clockwise until it con-
tacts the throttle slide then continue turning 2 ad-
ditional turns.
On twin carburetor models : Repeat on the oth-
er one. This will ensure identical throttle slide pre-
lim ina ry id le s et ting . R ec h ec k c ar bur eto r
synchronization. Adjust idle by turning both idle
speed screws of the same amount.
CAUTION : On twin carburetor models,
make sure both carburetors start to oper-
ate simultaneously. Beside do not interchange
carburetors, the jetting may be different on
each side. A color dot is printed on one carbu-
retor and on the engine. Match the carburetor
and the engine dots when applicable.
CAUTION : On oil injection models, the oil
injection p ump adjustment m ust be
checked each time carburetor is adjusted. Re-
fer to OIL INJECTION SYSTEM 04-06.
Throttle slide must be flush with the top of carbu-
retor
outlet bore.
THROTTLE LEVER AGAINST HANDLE GRIP
1. Throttle cable adjuster
2. Throttle slide flush with carburetor outlet bore
Once carburetor adjustment is performed, check
that
with the throttle lever fully depressed ,
there is a free play between the carburetor cover
and top of throttle slide.
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