Craftsman 917.271142 - Manual (Page 26)

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;
• With engine not running, move throttle
control lever from slow to choke
position. Slowly move lever from choke
to fast position.
• Check to see if hole in throttle lever and
hole in speed control bracket are
aligned.
• 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.
• Pull throttle cable up to remove slack
and tighten cable clamp screw. Re-
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 adjust­
ment, 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
needle is 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.
• Be sure you have a clean air filter and
the throttle control cable is adjusted
properly (see above).
• Start engine and allow to warm for five
minutes. Make adjustments with engine
running and shift/motion control lever in
neutral (N) position.
• 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,
• 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.
• Recheck idle speed. Readjust if
necessary.
ACCELERATION TEST-
• 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 your nearest authorized
service center/department, which has
proper equipment and experience to
make any necessary adjustments.
idle Speed
26