To Adjust Carburetor; Acceleration Test - Craftsman 917.271550 Owner's Manual

2. 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
Governor Control Lever Control Plate
\
Holes
"A"
Clamp Screw Throttle
Cable
TOADJUST 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 the cap. Do not attempt to remove
the limiter cap. 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, tuming idle mixture valve in
(clockwise) decreases the supply of fuel to
the engine giving a leaner fuel/air mixture.
Tuming the idle mixture valve out (counter-
clockwise) increases the supply of fuel to the
engine giving a richer fuel/air mixture.
IMPORTANT: Damage to the needle valve
and the seat in carburetor may result if screw
is turned in too tight.
PRELIMINARY SE-I-rlNG -
1. Air cleaner assembly must be assembled
to the carburetor when making carburetor
adjustments.
2. Be sure the throttle control cable is
adjusted properly (see above).
FINAL SE'n'ING -
1. Start engine and allow to warm for five
minutes. Make final adjustments with
engine running and shift/motion control
lever in neutral (N) position.
2. Move throttle control lever to slow
position. With finger, rotate and hold
throttle lever against idle speed screw.
Tum idle speed screw to attain 1750
RPM.
3. While still holding throttle lever against
idle speed screw, tum idle mixture valve
full travel clockwise then counterclock-
wise until engine runs rough. Tum 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,
tum idle mixture valve out (counterclock-
wise) 1/8 tum. 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
govemor, 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-govemed
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 Screw
_Z_,,,_ Throttle
_ Lever
[ [1"]_ I VJ_L._-_ Idle Mixture
"__ Valve with
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