Sears 917.259567 - Manual (Page 25)

SERVICE AND ADJUSTMENTS
TO ADJUST CARBURETOR (See Figs. 34 &
35)
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 the mixture screw in (clockwise) de­
creases the supply of fuel to the engine giving a leaner fuel/
air mixture. Turning the mixture screw
out (counterclock­
wise) increases the supply of fuel to the engine giving a
richer fuel/air mixture.
I M P O R T A N T : D A M A G E T O T H E N E E D L E S A N D T H E
S E A T S IN C A R B U R E T O R M A Y R E S U L T I F S C R E W I S
T U R N E D IN T O O T IG H T .
PRELIMINARY SETTING -
•> Be sure you have a clean air filter, and the throttle
control cable and choke are adjusted properly (see
above).
» With engine off turn idle mixture screw in (clockwise)
dosing it finger tight and then turn out (counterclock­
wise) 1-1/4 to 1-1/2 turns.
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.
• With throttle control lever in slow position, hold throttle
lever against idle speed screw and adjust idle speed
screw to obtain 1200 to 1400 RPM.
® While still holding throttle lever against idle speed
screw, turn idle mixture screw in (clockwise) until
engine begins to die and then turn out (counterclock­
wise) until engine runs rough. Turn screw to a point
midway between those two positions.
• Continue to hold throttle lever against idle speed screw
and adjust idle speed screw to obtain 900 to 1200 RPM.
Release throttle lever.
ACCELERATION TEST-
® Move throttle control lever from slow to fast position. If
engine hesitates or dies, turn idle mixture screw out
(counterclockwise) 1/8 turn. Repeat test and continue
to adjust, if necessary, until engine accelerates
smoothly.
High speed stop is factory adjusted. Do not adjust -
damage may result.
I M P O R T A N T : N E V E R T A M P E R W I T H T H E E N G I N E
G O V E R N O R , W H I C H I S F A C T O R Y S E T F O R P R O P E R
E N G I N E S P E E D . O V E R S P E E D I N G T H E E N G I N E A B O V E
T H E F A C T O R Y H IG H S P E E D S E T T IN G C A N B E
D A N G E R O U S . I F Y O U T H I N K T H E E N G I N E - G O V E R N E D
H I G H S P E E D N E E D S A D J U S T I N G , C O N T A C T Y O U R
N E A R E S T A U T H O R I Z E D S E R V I C E C E N T E R /
D E P A R T M E N T , W H I C H H A S P R O P E R E Q U I P M E N T A N D
E X P E R IE N C E T O M A K E A N Y N E C E S S A R Y
A D J U S T M E N T S .
F IG . 3 5
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