Craftsman 917.255561 - Manual (Page 23)

SERVICE AND ADJUSTMENTS
ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(Se© Fig. 29)
The thfottie controi has been preset at the factory and
adjustment should not be necessary. Check adjustment as
described below before loosening cable. If adjustment is
necessary* proceed as follows:
* With engine not running, move throttle controi lever
from '‘SLOW to “CHOKE" position. Slowly move lever
from "CHOKE“ to "FAST" position.
* Check that holes "A" in governor control lever and hole
in governor plate line-up. If holes "A” are not aligned,
loosen clamp screw and move throttle cable until holes
are aligned. Tighten damp screw securely.
TO ADJUST CARBURETOR (See Fig. 30;
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 infuei,
temperature, attitude or load, if the carburetor does need
adjustment, proceed as follows:
In general, turning idle mixture valve In (ciockwise) de­
creases the supply of fuel to the engine giving a leaner fuel/
air mixture. Turning the idle mixture valve out_(counter-
ciockwise) 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 SETTIN6 -
• 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 (ciockwise)
closing it finger tight and then turn out (counterclock­
wise) Ifullturn.
FINAL SETTING -
• Start engine and allow to warm forfive minutes. Make
final adjustments with engine running and shift/moiion
control lever in "NEUTRAL" 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 (counterdockwise)
until engine runs rough. Turn valve to a point midway
between those two positions. Release throttle lever.
ACCELERATÎON TEST -
• Move throttle control lever from "SLOW" to "FAST"
position. If engine hesitates or dies, turn idie 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, OVERSPEEDING THE 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, WHICH HAS
PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY
NECESSARY ADJUSTMENTS
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