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SERVICE A
TO ADJUST CARBURETOR (See Fig. 28)
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 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.
o 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 positionso Release throttle lever..
ADJUSTMENTS
ACCELERATION TEST -
° Move throttle control lever from slow (,_) to fast (,@)
positiono if 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. OVERSPEEDINGTHE ENGINE ABOVE
THE FACTORY HIGH SPEED SETTING CAN BE
DANGEROUS. IF YOU THiNKTHE 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, 28
25