To Adjust Carburetor - Craftsman 917.271061 Owner's Manual

o 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.
Remove alignment pencil or drill bit.
Cable
Screw
Speed Control
Bracket
Throttle
Lever
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 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
propedy (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 AUTHO-
RIZED service center/department, which
has proper equipment and experience to
make any necessary adjustments.
Idle Speed
Adjusting
Screw
Idle Fuel
Adjusting
Needle
26