Craftsman 917.273481 - Manual (Page 28)

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The choke control has been preset at the
factory and adjustment should not be nec­
essary. check adjustment as described be­
low before loosening cable. If adjustment
is necessary, proceed as follows;
1. With engine not running, move choke
control (located on dash pane!) to full
choke position.
Remove air cleaner cover, filter and
cartridge plate to expose carburetor
choke (See “AIR FILTER” in the Main­
tenance 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.
TO ADJUST CHOKE CONTROL
Closed For Fui
Choke
TO ADJUST CARBURETOR
The carburetor has been present at the
factory and adjustment should not be nec­
essary. 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 adjusting needles
In (clockwise) decreases the supply of
fuel to the engine giving a leaner fuel/air
mixture. Turning the adjusting needles out
(counterclockwise) 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 -
1. Be sure you have a clean air filter, and
the throttle control cable is adjusted
properly (see “TO ADJUST THROTTLE
CONTROL CABLE” in the Service and
Adjustments section of this manual).
2. With engine off turn idle fuel adjust­
ing needle in (clockwise) closing it
finger tight and then turn out (counter­
clockwise) 1 turn.
FINAL SETTING -
1. Start engine and allow to warm for five
minutes. Make final adjustments with
engine running and shift/motion control
lever in neutral (N) position.
NOTE: The high idle is set at the factory
and cannot be adjusted.
2. Idle speed setting - With throttle control
lever in slow position, engine should
idle at 1750 RPM. If engine idles too
slow or fast, turn idle speed adjusting
screw in or out until correct idle is at­
tained.
3. idle fuel needle setting - With throttle
control lever in slow position, turn idle
fuel adjusting needle
In (clockwise)
until engine speed decreases and then
turn out (counterclockwise) approxi­
mately 3/4 turn to obtain the best low
speed performance.
4. Recheck idle speed. Readjust if neces­
sary.
ACCELERATION TEST -
5. 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 continue to adjust, if neces­
sary, 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 ad­
justing, contact a Sears or other qualified
service center, which has proper equip­
ment and experience to make any neces­
sary adjustments.
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