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SERVICE AND ADJUSTM
NTS
TO ADJUST
CARBURETOR
(See Fig. 34)
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. If the carburetor does need
adjustment, proceed as follows:
In general, tuming idle mixture valve in (clockwise) de-,
creases the supply of fuel to the engine giving a leaner 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 SETTING -
,
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 -
•
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 lever to 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 f!,"._mslow (,_!)
to fast (_ll_)
pOsition,
tf engine
hesitates
or dies, turn idle mixture
valveout
(countercfockwise)
!i8tum.
Repeattest
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
ENG{NE
GOVERNOR,
WHICH
tS 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
LEVER
SCREW
IDLE MIXTURE
VALVE
FIG. 34
26
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