Craftsman 917.272057 - Manual (Page 26)

ENGINE
Maintenance, repair, or replacement of
the emission control devices and sys­
tems, which are being done at the
customers expense, may be performed
by any non-road engine repair establish­
ment or individual. Warranty repairs must
be performed by an authorized engine
manufacturer's service outlet,
TO ADJUST THROTTLE CONTROL
CABLE
The throttle 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:
1. With engine not running, move throttle
control lever from slow to choke
position, Slowly move lever from
choke to fast position.
2. Check to see if hole in throttle lever
and hole in speed control bracket are
aligned.
3. 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.
4. Pull throttle cable up to remove slack
and tighten cable clamp screw.
Remove alignment pencil or drill bit.
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
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 seats in carburetor may result if
turned in too tight.
NOTE: The carburetor on this engine is
low emission. It is equipped 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 needle.
1. Be sure you have a clean air filter and the
throttle control cable is adjusted properly
(see above).
2. Start engine and allow to warm for five
minutes. Make adjustments vwth engine
running and shift/motion control lever in
neutral (N) position.
3. 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 attained.
4. 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
(counterclockwise) until engine runs
rough. Turn needle to a point midway
between those two positions.
5. Recheck idle speed. Readjust if neces­
sary.
ACCELERATION TEST-
6. 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.
Cable
Clamp
Screw
Thrott e Lever
Idle Speed
Adjusting
Screw
Idle Fuel
Adjusting
Needle
26