Sears 917.25545 - Manual (Page 23)

SERVICE AND ADJUSTMENTS
ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 30)
The throttle control has been preset at the factory and
adjustment should not be necessary. Check adjustment as
described below before loosening cable- If adjustment is
necessary, procede as follows:
<* With engine not running, move throttle control lever
from “SLOW" to “CHOKE" position. Slowly move lever
from “CHOKE" to "FAST” position.
o Check to see if hole in throttle lever and hole in speed
control bracket are aligned.,
® If holes are not aligned, loosen cable clamp screw and
align the holes by inserting a pencil or a 1/4" drill bit
through both holes,
* Pull throttle cable up to remove slack and tighten cable
clamp screw. Remove alignment pencil or drill bit,
TO ADJUST CARBURETOR (See Fig. 31;
The carburetor has been preset at the factory and adjust­
ment should not be necessary. However, minor adjust­
ment may be required to compensate fordifferences in fuel,
temperature, altitude or load. If the carburetor does need
adjustment, proceed as follows:
In general, turning the adjusting needles in (clockwise)
decreases the supply of fuel to the engine giving a leaner
fuel/air mixture, Turning the adjusting needles out (counter­
clockwise) increases the supply of fuel to the engine giving
a richer fuel/air mixture.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT IF NEEDLE IS
TURNED IN TOO TIGHT.
PRELIMINARY SETTING -
" Be sure you have a clean air filter and the throttle
control cable is adjusted properly (see above).
» With engine off turn idle fuel adjusting needle in (clock­
wise) closing it finger tight and then turn out (counter-
clockv/ise) 1 turn.
FINAL SETTING-
* Start engine and allow to warm forfive minutes. Make
final adjustments with engine running and shift/motion
control lever in “NEUTRAL" position.
“ Idle speed setting - With th rottle control lever in "SLOW”
position, engine should idle at 1625 RPM. If engine
idles too slow orfast, turn idle speed adjusting screw in
or out until correct idle is attained.
“ Idle fuel needle setting - With throttle control lever in
“SLOW" position, turn idle fuel adjusting needle in
(clockwise) until engine begins to die and then turn out
(counterclockwise) approximately 1/8 to 1/4 turn to
obtain best low speed performance.
“ Recheck idle speed. Readjust if necessary.
ACCELERATION TEST -
® Move throttle control lever from “SLOW” to “FAST"
position. If engine hesitates or dies, turn idle fuel
adjusting needle out (counterclockwise) 1/8 turn. Re­
peat test and continue to adjust, if necessary, until
engine accelerates 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
ENGINESPEED. 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 SEARS SERVICE CENTER, WHICH HAS
PROPER EQUIPMENT AND EXPERIENCETOMAKE ANY
NECESSARY ADJUSTMENTS,
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