Service And Adjustments - Craftsman 944.609150 Owner's Manual

SERVICE AND ADJUSTMENTS
clockwise) increases the supply of fuel to the engine giving
ENGINE
a richer fuel/air mixture.
Maintenance, repair, or replacement of the emission con-
trol devices and systems, which are being done at the
customers expense, may be performed by any non-read
engine repair establishment or individual. Warranty repairs
must be performed by an authorized engine manufacturer's
service outlet.
TO ADJUST THRO'n'LE CONTROL CABLE
(See Fig. 41)
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 slow to choke position. Slowly move lever from
choke to fast position.
• Checkthat holes'A" in governor control lever and hole
in governor plate line-up. If holes =A" are not aligned,
loosen clamp screw and move throttle cable until holes
are aligned. Tighten clamp screw securely.
GOVERNOR
CONTROLLEVER
GOVERNOR
CONTROLPLATE
\
HOLES"A" CLAMP THROTTLE
SCREW CABLE
FIG. 41
TO ADJUST CARBURETOR (See Fig; 42)
NOTE: The carburetor on this engine is low emission. It is
equipped with an idle fuel adjusting needle with a limiter
cap, which allows some adjustment within the limits al-
lowed by the cap. Do not attempt to remove the limiter cap.
The ,miter cap cannot be removed without breaking the
adjusting needle.
The carburetor has been preset at the factory a_ndadjust-
ment should not be necessary. However, minor adjust-
ment may be required tocompensate for differences infuel,
temperature, altitude or load. If the carburetor does need
adjustment, proceed as follows:
In general, turning idle mixture valve in (clockwise) de-
creases the supply of fuel to the engine giving a leaner fuel/
air mixture. Turning the idle mixture valve out (counter-
IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND
THE SEAT IN 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).
FINAL SEI-]ING -
• Start engine and allow to warm for five minutes. Make
final adjustments with engine running and shift/motion
control lever,in neutral (N) position.
• Move throttle control leverto slow position. With finger,
rotate and hold throttle lever against idle speed screw.
Turn idle speed screw to attain 1750 RPM.
• While still holding throttle lever against idle speed
screw, turn idle mixture valve full travel clockwise then
counterclockwise until engine runs rough. Turn valve
to a point midway between those two positions. Re-
lease throttle lever.
ACCELERATION TEST -
• Move throttle control lever f[om slow to fast position. If
engine hesitates or dies, turn idle mixture valve out
(counterclockwise) 118turn. 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
NEAREST AUTHORIZED SERVICE CENTER/
DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND
EXPERIENCE TO MAKE ANY NECESSARY
ADJUSTMENTS.
IDLE SPEED THROTTLE
I
FIG, 42
28