23
SERVICE AND ADJUSTMENTS
TO AD JUST CARBURETOR (See Fig. 29
)
NOTE:
The carburetor on this engine is low emission. It
is equipped with an idle fuel adjusting needle with a lim-
iter cap, which allows some adjustment within the limits
al lowed by the cap. Do not attempt to remove the limiter
cap. The limiter cap cannot be removed without breaking
the adjusting needle.
The carburetor has been preset at the factory and ad just ment
should not be necessary. However, minor ad just ment may be
required to compensate for differences in fuel, temperature,
altitude or load. If the carburetor does need adjustment,
proceed as follows:
In general, turning idle mixture valve
in
(clock wise) de-
creases the supply of fuel to the engine giving a leaner
fuel/air mixture. Turning the idle mixture valve
out
(coun-
ter clock wise) in creases the sup ply of fuel to the engine
giving a richer fuel/air mixture.
IMPORTANT:
DAMAGE TO THE NEEDLE VALVE AND THE
SEAT IN CARBURETOR MAY RE SULT IF SCREW IS TURNED
IN TOO TIGHT.
PRELIMINARY SETTING -
• Air cleaner assembly must be assembled to the car bu -
re tor when making carburetor adjustments.
• Be sure the throttle control cable is adjusted properly
(see above).
FINAL SETTING -
• Start engine and allow to warm for fi ve minutes. Make
fi nal adjustments with engine running and shift/motion
control lever in neutral (
N
) position.
• Move throttle control lever to slow position. With fi nger,
rotate and hold throttle lever against idle speed screw.
Turn idle speed screw to attain 1750 RPM.
• While still holding throttle lever against idle speed screw,
turn idle mix ture valve full travel clockwise then coun-
ter clock wise until engine runs rough. Turn valve to a
point midway be tween those two positions. Re lease
throt tle lever.
ACCELERATION TEST -
• Move throttle control lever from slow to fast po si tion.
If engine hesitates or dies, turn idle mixture valve
out
(counter clock wise) 1/8 turn. Repeat test and con-
tinue to adjust, if nec es sary, until engine ac cel er ates
smooth ly.
High speed stop is factory adjusted. Do not adjust - dam-
age may result.
IMPORTANT:
NEVER TAMPER WITH THE ENGINE GOVERNOR,
WHICH IS FACTORY SET FOR PROPER ENGINE SPEED.
OVER SPEED ING THE ENGINE ABOVE THE FACTORY HIGH
SPEED SETTING CAN BE DANGEROUS. IF YOU THINK THE
ENGINE-GOVERNED HIGH SPEED NEEDS ADJUSTING,
CONTACT YOUR NEAREST AUTHORIZED SERVICE CENTER/
DEPARTMENT, WHICH HAS PROPER EQUIP
MENT AND
EXPERIENCE TO MAKE ANY NEC ES SARY ADJUSTMENTS.
FIG. 29
THROTTLE
LEVER
IDLE SPEED SCREW
IDLE MIXTURE
VALVE WITH LIMITER
