Craftsman 917.271653 - Manual (Page 26)

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. W arranty
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 .
2 .
W ith engine not running, move throttle
control lever from slow to choke position.
Slowly rrrove lever from choke to fast
position.
Check that holes “A” in governor control
lever and hole in governor plate line-up.
If holes “A” are not aligned, loosen clamp
screw and move throttle cable until holes
are aligned. Tighten clamp screw
securely.
Governor
Control Lever
Governor
Control Plate
Holes
r
Throttle
Cable
TO ADJUST CARBURETOR
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 frie cap. Do not attempt to remove
the limiter c^. The limiter cap cannot be
removed without breaking the adjusting
needle.
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 idle mixture valve in
(clockwise) decreases frie supply of fuel to
the engine giving a leaner fuel/air mixture.
Turning the idle mixture valve out (counter­
clockwise) increases the supply of fuel to the
engine giving a ridier fuel/air mixture.
2.
3.
IMPORTANT: Damage to the needle valve
and the seat in carburetor may result if screw
is turned in too tight.
PRELIMINARY SETTING -
1. Air cleaner assembly must be assembled
to the carburetor when making carburetor
adjustments.
2. Be sure the throttle control cable is
adjusted property (see above).
FINAL SETTING-
1. Start engine and allow to warm for five
minutes. Make final adjustments with
engine mnning and shift/motion control
lever in neutral
(N) position.
Move throtde control lever to stow
position. W ith finger, rotate and hold
throttle lever against idle speed screw.
Turn idle speed screw to attain 1750
RPM.
W hile still holding throttle lever against
idle speed screw, turn idle mixture valve
full travel clockwise then counterclock­
wise until engine runs rough. Turn valve
to a point midway between those two
positions. Release throttle lever.
ACCELERATION TEST-
4. Move throttle control lever from slow to
fast position, if engine hesitates or dies,
turn idle mixture valve out (counterclock­
wise) 1/8 turn. Repeat test and continue
to adjust, if necessary, until engine
accelerates smoothly.
High speed stop is factory adjusted. Do not
adjust or 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 sen/ice center,
which has proper equipment and experience
to make any necessary adjustments.
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