To Adjust Choke Control; To Adjust Carburetor; Acceleration Test - Craftsman 917.276012 Owner's Manual

Idle Fuel Adjusting Idle Speed
Needle (If Ad usting Screw
E(
Throttle
Control
Cable
Stop
Screw
Choke
Control
Clamp Screw
TO ADJUST CHOKE CONTROL
The choke control has been preset at the
factory and adjustment should not be nec-
essary, check adjustment as described
below before loosening cable. If adjust-
ment is necessary, proceed as follows:
1. With engine not running, move choke
control (located on dash panel) to full
choke position.
2. Remove air cleaner cover, filter and
cartridge plate to expose carburetor
choke (See "AIR FILTER" in the Main-
tenance section of this manual).
3. 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.
4. Reassemble air cleaner.
Closed For Full 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 (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 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 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 a Sears
or other qualified service center, which has
proper equipment and experience to make
any necessary adjustments.
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