Craftsman 917.273170 - Manual (Page 26)

ENGINE
Maintenance, repair, or replacement of
the emission control devices and systems,
which are being done at the customers ex­
pense, 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 y^pjysj-j-j^i^oTTLE CONTROL
CABLE
The throttle control has been preset at the
factory and adjustment should not be nec­
essary. Check adjustment as described
below before loosening cable. If adjust­
ment is necessary, proceed as follows:
1. With engine not running, move throttle
control lever from slow to choke posi­
tion. 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. Re­
move alignment pencil or drill bit.
TO ADJUST CARBURETOR
The carburetor has been preset at the
factory and adjustment should not be nec­
essary. 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 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 at­
tained.
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 nec­
essary.
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 neces­
sary, 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. Overspeed­
ing 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.
idle Speed
Adjusting
Screw
Idle Fuel
Adjusting
Needle
26