To Adjust Choke Control; To Adjust Carburetor; Preliminary/Final Setting; Acceleration Test - Craftsman 944.601892 Owner's Manual

SERVICE AND ADJUSTMENTS
TO ADJUST CHOKE CONTROL (See Fig. 31)
The choke 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 choke control (located on
dash panel) to full choke position.
Remove air cleaner cover, filter and cartridge plate to
expose carburetor choke (see "AIR FILTER" in the
Customer Responsibilities section of this manual).
Choke should be closed. If it is not, loosen casing clamp
screw and move choke cable until choke is completely
closed. Tighten casing clamp screw securely.
Reassemble air cleaner.
CHOKE CLOSE_
CASING
FIG. 31
TO ADJUST CARBURETOR (See Figs, 32 &
33)
The carburetor has been preset at the factory and adjust-
ment should not be necessary. However, minor adjustment
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 screw in (clockwise) de-
creases the supply of fuel to the engine giving a leaner fuel/
air mixture. Turning the mixture screw 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 SCREW IS
TURNED IN TOO TIGHT,
PRELIMINARY SETTING -
• Be sure you have actean airffiter, andthethrottle control
cable and choke are adjusted properly (see above).
With engine off turn idle mixture screw in (clockwise)
closing it finger tight and then turn out (counterclock-
wise) 1-1/4 to 1-1/2 turns.
FINAL SETTING -
Start engine and allow to warm for five minutes. Make
final adjustments with engine running and shift/motion
control lever in neutral (N) position.
• With throttle control lever in slow position, hold throttle
lever against idle speed screw and adjust idle speed
screw to obtain 1200 to 1400 RPM.
While still holding throttle lever against idle speed screw,
turn idle mixture screw in (clockwise) until engine begins
to die and then turn out (counterclockwise) until engine
runs rough. Turn screw to a point midway between t hose
two positions.
Continue to hold throttle lever against idle speed screw
and adjust idle speed screw to obtain 900 to 1200 RPM.
Release throttle lever.
ACCELERATION TEST -
• Move throttle control lever from slow to fast position. If
engine hesitates or dies, turn idle 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
NEAREST AUTHORIZED SERVICE CENTER/
DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND
EXPERIENCE TO MAKE ANY NECESSARY
ADJUSTMENTS.
IDLE SPEED
SCREW
IDLE MIXTURE
SCREW
OTTLE
LEVER
FIG. 32
IDLE SPEED _
LEVER IDLE MIXTURE
SCREW
FIG. 33
23