Throttle Control Cable - Craftsman 917.255942 Owner's Manual

SERVICE AN ADJUSTMENTS
TO ADJUST CARBURETOR
(See Figs.
47 and
48)
The carburetor has been present at the factory and adiust-
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 not
need adjustment, proceed as follows:
In general, turning the mixture screw in (clockwise) de-
cr eases 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,
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT IF SCREW IS
TURNED IN TOO TIGHT,
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)
closing 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" 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 accel-
erates smoothly.
High speed stop is factory adjusted. Do not adjustodamage
may result.
IMPORTANT: 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. IFYOU THINKTHE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
NEAREST SEARS SERVICE CENTER, WHICH HAS
PROPER EQUIPMENTAND EXPERIENCETO MAKEANY
NECESSARY ADJUSTMENTS.
IDLE SPEED
IDLE MIXTURE
SCREW
THRO_'LE
LEVER
FIGo47
IDLE SPEED
SCREW_I
THROTTLE
LEVER
_IDLE MIXTURE
SCREW
FIG. 48
26