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SERVUCE AND ADJUSTMENTS
TO ADJUST
CARBURETOR
(See Fig. 30)
The carburetor has been preset at the factory and adjust-
ment should not be necessary_
However, minor adjust-
ment may be required to compensate for differences in fuel,
temperature, altitude or load. tf the carburetor does need
adjustment, proceed as follows:
In general, turning idle mixture valve in (clockwise) de-
creases the supply of fuel to the engine giving a teaner fuel/
air mixture.
Turning the idle mixture valve out (counter-
clockwise) increases the supply of fuel to the engine giving
a richer fuel/air mixture°
IMPORTANT:
DAMAGE
TO THE NEEDLE
VALVE
AND
THE SEAT IN CARBURETOR
MAY RESULT
IF SCREW IS
TURNED
IN TOO TIGHT°
PRELIMINARY
SE'f-I'ING -
o
Air cleaner assembly must be assembled to the carbu-
retor when making carburetor adjustments
•
Be sure the throttle control cable is adjusted properly
(see above).
°
With engine off turn idle mixture valve in (clockwise)
closing it finger' tight and then turn out (counterclock-
wise) 1 full turn.
FINAL SETTING -
o
Start engine and allow to warm for five minutes. Make
final adjustments with engine running and shift/motion
control lever in neutral (N) position
°
Move throttle control leverto slow (,,_) position,, With
finger, 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 mixture valve in (clockwise) until en-
gine begins to die and then turn out (counterclockwise)
until engine runs rough. Turn valve to a point midway
between those two positions.
Release throttle lever,
ACCELERATION
TEST -
°
Move throttle control
lever from slow (,,_)
to fast (,_)
position_
ff engine
hesitates
or dies, turn idle mixture
valve out (counterclockwise)
1/8 turn. Repeat test and
continue
to adjust,
if necessary,
until engine
acceler-
ates smoothly.
High
speed
stop
is factory
adjusted,
Do not adjust
-
damage
may result.
IMPORTANT:
NEVER
TAMPER
WITH
THE
ENGINE
GOVERNOR,
WHICH
IS FACTORY
SET
FOR PROPER
ENGINE SPEED.. OVERSPEEDING
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
EQUIPMENT
AND
EXPERIENCE
TO
MAKE
ANY
NECESSARY
ADJUSTMENTS.
THROTTLE
IDLE SPEED
SCREW
IDLE MIXTURE VALVE
FIG. 30
24
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