Throttle Control Cable - Craftsman 917.257480 Owner's Manual

SERVUCE AND ADJUSTMENTS
TO ADJUST CARBURETOR
(See Fig. 34 & 35)
The carburetor has been preset at the factory and adjust-
ment should not be necessary. However, minor adjustment
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.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT
IF SCREW 1S 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) !-1/4 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 homing throttle lever against idle speed
screw, turn idle mixture screw in (clockwise) until en-
gine begins to die and then turn out (counterclockwise)
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 tf 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 smoothfy_
High speed stop is factory adjusted Do not adjust- damage
may result
IMPORTANT: NEVER TAMPER WITH THE ENGlNE
GOVERNOR, WHICH IS FACTORY SET
FOR PROPER ENGINE SPEED. OVER-
SPEEDING THE ENGINE ABOVE THE
FACTORY HIGH SPEED SETTING CAN
BE DANGEROUS° IF YOU THINK THE
ENGINE-GOVERNED HIGH SPEED
NEEDS ADJUSTING, CONTACT YOUR
NEAREST AUTHORIZED SERVICE
CENTER, WHICH HAS PROPER EQUIP-
MENTAND EXPERIENCE TO MAKE ANY
NECESSARY ADJUSTMENTS.
FIG. 34
IDLE SPEED (__
so==
)
THROTTLE
LEVER
-7
IDLE MIXTURE
SCREW
FIG. 35
25