Throttle Control Cable - Craftsman 917.254750 Owner's Manual

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SERVICE AND ADJUSTMENTS
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ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 29)
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, proceed as follows:
• With engine no!, runningl, move throttle control lever
from 'SLOW to CHOKE position Slowly movelever
from "CHOKE" to "FAST" position.
• Check that hole in throttle lever and hole in plate line up.
If holes "A" are not aligned, loosen clamp screw and
move throttle cable until holes are aligned Tighten
clamp screw securely
TO ADJUST CARBURETOR (See Fig. 29)
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 screws in (clockwise) de-
creases the supply of fuel to the engine giving a leaner fuel/
air mixture Turning the mixture screws 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 SCREWS
ARE 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 high speed mixture screw in
(clockwise) closing it finger tight and then turn out
(counterclockwise) 1-l/2 turns
• Turn idle mixture screw in (clockwise) closing finger
tight and then turn out (counterclockwise) 1 turn
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
o With throttle control lever in "FAST" position, turn high
speed mixture screw in (clockwise) until engine begins
to die then turn out (counterclockwise) until engine
runs rough Turn screw to a point midway between
those two positions
• With throttle control lever in "SLOW" position, turn idle
mixture screw in (clockwise) until engine beginsto die
and then turn out (counterclockwise) until engine runs
rough. Turn screw to a point midway between those
two positions°
• With throttle control lever in "SLOW" position, engine
should idle at 2100 RPM tfengine idles too slow, turn
idle speed screw in (clockwise).
. If engine idles too fast in "SLOW" position, turn idle
speed screw out (counterclockwise).
ACCELERATION TEST -
• Move throttle control lever from "SLOW" to "FAST"
position° If engine hesitates or dies, turn high speed
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.
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 THINK THE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
NEARESTAUTHORtZED SERVICE CENTER, WHICH HAS
PROPER EQUIPMENTAND EXPERIENCETO MAKE ANY
NECESSARY ADJUSTMENTS.HIGH SPEED NEEDS
ADJUSTING, CONTACT YOUR NEAREST AUTHORIZED
SERVICE CENTER, WHICH HAS PROPER EQUIPMENT
AND EXPERIENCE TO MAKE ANY NECESSARY
ADJUSTMENTS
PLATE
IDLE SPEED SCREW
THROTTLE CABLE
SCREW
HOLE"A"
/
THROTTE LEVER
_FAST
IDLE
MIXTURE
SCREW
HIGH SPEED
MIXTURE SCREW
FIGo 29
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