To Adjust Choke Control; To Adjust Carburetor; Preliminary Setting; Final Setting - Craftsman 917.270930 Owner's Manual

TO ADJUST CHOKE CONTROL
The choke control has been preset at the
factory and adjustment should not be
necessary. Check adjustment as de-
scribed 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
Maintenance 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
Screw Choke Lever
TO ADJUST CARBURETOR
The carburetor has been preset at the
factory and adjustment 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 adjust-
ment, proceed as follows:
In general, turning the mixture screw in
(clockwise) decreases the supply of fuel to
the engine giving a leaner fuel/air mixture.
Turning the mixture screw 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 screw
is turned in too tight.
PRELIMINARY SEI-I-ING -
• Be sure you have a clean air filter, and
the throttle 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 (counterclockwise) 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 (counterclock-
wise) until engine runs rough. Turn
screw to a point midway between those
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 (counter-
clockwise) 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.
ldle Speed
crew
Idle Mixture
Screw
ThrottleLever
Idle Speed
Screw __
Throttle "_'-'-_'_, _)J_ !d!e. r
v r _: '_-_--_(_-_-_L/ MIX_Ue
Le e crew
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