Poulan 157469 - Manual (Page 25)

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ENGINE
INTROL CABL TO ADJUST THROTTLE
(See Fig. 29)
The throttle control has been preset at the factory and
adjustment should not be necessary. Check adjustment as
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TO ADJUST CARBURETOR (See Fig. 30j
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 infuel,
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.
I M P O R T A N T : 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 oft turn idle mixture valve in (clockwise)
closing it finger tight and then turn out (counterclock­
wise) 1 full turn.
....... .........................
• Start engine and allow to warm for five minuies. Make
final adjustments with engine running and shiit/riiotion
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 from slow l-m
1
ty fast (*%)
position. It 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.
I M P O R T A N T : NEVER TAMPER WITH THE ENGINE
GOVERNOR, WHICH IS FACTORY SET FOR PROPER
ENGINE SPEED. OVERSPEEDING THE ENGINEABOVE
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.
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