Craftsman 917.28634 Operator's Manual page 27

ENGINE
Maintenance, repair, or replacement of the
emission control devices and systems, which
are being done at the customers expense,
may be performed by any non-road engine
repair establishment 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 described
below before loosening cable. If adjustment
is necessary, proceed as follows:
1. With engine not running, move throttle
control tever 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. Ifhotes are notaligned, Ioosen cable clamp
screw and align the holes by inserting a
pencil or a I/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 fac-
tory and adjustment should not be neces-
sary. 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 tothe
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_ tt 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 timiter cap
cannot be removed without breaking the
adjusting needle.
1_ Be sure you have a clean ai r filter and the
throttle control cable is adjusted properly
(see above),
2. Start engine and allow to warm for five
minutes_ Make adjustments with 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. !die. fuel needle setting - With throttle
control lever in stow 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 nec-
essary.
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.
Throttle Lever
spo &b,o
Control I_/'''J \ Clamp
Bracket _,_t__ Screw
Idle Speed
Adj
Screw
Idle Fue!
Ad
Needle
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