To Adjust Throttle Control Cable; To Adjust Carburetor; Acceleration Test - Craftsman 917.255692 Owner's Manual

SERVICE AND ADJUSTMENTS
ENGRNE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 30)
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, procede as follows:
o With ,engineno!, running;, move throttle control lever
from SLOW to CHOKE position. Slowly move lever
from "CHOKE" to "FAST" position,
° Check to see if hole in throttle lever and hole in speed
control bracket are aligned_
° If holes are not aligned, loosen cable clamp screw and
align the holes by inserting a pencil or a t/4" drill bit
through both holes°
• Pull throttle cable up to remove slack and tighten cable
clamp screw. Remove alignment pencil or drill bit..
TO ADJUST CARBURETOR (See Fig. 31)
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 adjusting needles in (clockwise)
decreases the supply of fuel to the engine giving a leaner
fue!/air mixture. Turning the adjusting needles out (counter-
clockwise) 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 tF NEEDLE IS
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 offturn idlefuel adjusting needle in (clock-
wise) closing it finger tight and then turn out (counter-
clockwise) 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.
° ld!e speed setting-With throttle control lever in"SLOW"
position, engine-should idle at 1625 RPM. If engine
idles too slow or fast, tu rn idle speed adjusting screw in
or out until correct idle is attained_
° idle fuel needle setting - With throttle control lever in
"SLOW" position, turn idle fuel adjusting needle in
(,clockwise) until engine begins to die and then turn out
(.counterclockwise) approximately 1/8 to '1/4 turn to
obtain best tow speed performance.
o Recheck idle speed.. Readjust if necessary°
ACCELERATION TEST -
o Move throttle control lever from "SLOW" to "FAST"
position, If engine hesitates or dies, turn idle fuel
adjusting needleout (counterclockwise) t/Stum. Re-
peat test and continue to adjust, if necessary, until
engine accelerates smoothly°
High speed stop is factory adjusted. Do not adjust -
damage may resulL
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
NEAREST SEARS SERVICE CENTER, WHICH HAS
PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY
NECESSARY ADJUSTMENTS°
CABLE
SPEED
THROTTLE LEVER
FIG. 30
IDLE SPEED ADJUSTING SCREW
IDLE FUEL ADJUSTING NEEDLE
FIG. 31
23