Craftsman 944.602951 - Manual (Page 23)

SERVICE AND ADJUSTMENTS
ENGINE
Maintenance, repair, or replacement of the emission control
devices and systems, which are being done at the custom*
ars expense, may be performed by any non-road engine
repairestablishment or individual. Warranty repairs must be
oerformed by an authorized engine manufacturer's service
DUtlet.
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 31)
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 leverfrom
slowto choke position. Slowly move leverfrom 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 1/4" 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. 32)
The carburetor has been preset at the factory and adjust­
ment should not be necessary. However, mi nor adjustment
may be required to compensate for differences in fuel,
[emperature, 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
fuel/air mixture. Tuming 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 IF NEEDLE IS
TURNED IN TOO TIGHT.
NOTE: The carburetor on this engine is low emission. It is
aquipped with an idle fuel adjusting needle with a limiter cap,
which allows some adjustment within the limits allowed by
the cap. Do not attempt to remove the limiter cap. The limiter
cap cannot be removed without breaking the adjusting
ne^le.
•
Be su re you have a clean ai r filter and the throttle control
cable is adjusted properly (see above).
• Start engine and allow to warm for five minutes. Make
adjustments with engine oinning and shift/rrx)tion control
lever in neutral (N) position.
• Idle speed setting - With throttle control lever in slow
position, engine should idle at 1750 RPM. If engine idles
too slow orfast, turn idle speed adjusting screw in orout
until correct idle is attained.
• Idle fuel needle setting - With throttle control lever in slow
position, turn idle fuel adjustment needle in (clockwise)
until engine begins to die and then turn out (counter­
clockwise) until engine runs rough.Tum needle toa point
midway between those two positions.
• Recheck idle speed. Readjust if necessary.
ACCELERATION TEST-
• Move throttle control lever from slow to fast position. If
engine hesitates or dies, turn idle fuel adjusting needle
out (counterclockwise) 1/8 turn. Repeat test and con­
tinue 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
E X P E R I E N C E T O M A K E A N Y N E C E S S A R Y
ADJUSTMENTS.
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