SERVICE A
ADJUSTMENTS
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, turning 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 fue!/air mixture.
IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND
THE SEAT IN CARBURETOR MAY RESULT tF 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 vatve 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 idte 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
o Move throttle control lever from slow (,,J_) to fast (,_)
position° If engine hesitates or dies, turn idle mixture
vatveout (counterclockwise) 1/8turn. 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 WtTH THE ENGINE
GOVERNOR, WHICH IS FACTORY SET FOR PROPER
ENGINE SPEED° OVERSPEEDING THE ENGINE ABOVE
THE FACTORY HIGH SPEED SETTING CAN BE
DANGEROUS IFYOUTHINKTHEENGINE-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
