Throttle Control Cable - Sears Craftsman 917.257630 Owner's Manual

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SERVmCE AN
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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 not running, move throttle control lever
from s_ow (._) to choke ( \ ) position. Slowly move
ever from choke ( \ ) to fast (.'_) position.
• Check that holes"A" in governor control lever and hole
in governor plate line-up. Jfholes "A" are not aligned,
loosen clamp screw and move throttle cable until holes
are aligned.. Tighten clamp screw securely.
GOVERNOR
CONTROL LEVER
GOVERNOR
CONTROL PLATE
HOLES"A" CLAMP THROTTLE
SCREW CABLE
FIG., 29
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 in fuel,
temperature, aft[tude or load if the carburetor does need
adjustment, proceed as follows:
In general, turning idle mixture valve in (clockwise) de-
creases the supply of fue! to the engine giving a tearier fuel/
air mixture. Turning the idle mixture vatve out (counter-
clockwise) increases the supply of fuel to the engine giving
a richer fuet/aJr mixture..
IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND
THE SEAT tN CARBURETOR MAY RESULT IF SCREW IS
TURNED IN TOO TIGHT.
PRELIMINARY SETTING -
,, 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 (clockwise)
closing it finger tight and then turn out (counterclock-
wise) 1 fullturn
FINAL SETTING -
• Start engine and allow to warm for five minutes. Make
fina_adjustments with engine running and shift/motion
control lever in neut[al (N) position.
• Move throttle control lever to slow (._) position. With
finger, rotate and hold throttie lever against idle speed
screw. Turn idle speed screw to attain 1750 RPM.
• While still holding throttle lever against idle s_,eed
screw, turn idle mixture valve in (clockwise) until en-
gine begins to die and then turn out (counterclockwise)
until engine runs rough. Turn valve to a point midway
between those two positions. Release throttle lever.
ACCELERATION TEST
o Move throttle control lever from slow (-_.) to fast (,@)
position. If engine hesitates or dies, turn idle 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 OVERSPEEDtNG 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/
DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND
EXPERIENCE TO MAKE ANY NECESSARY
ADJUSTMENTS.
THROTTLE IDLE SPEED
LEVER SCREW
IDLE MIXTURE
VALVE
FIG. 30
'9"4