Craftsman 917.271742 - Manual (Page 27)

ENGINE
Maintenance, repair, or replacement of the
emission corrtrol devices and systems, which
are being done at the customers expense,
may be performed by any norMoad engine
repair establishment or individual. Warranty
repairs must be performed by an authorize
engine manufacturer's service outlet.
TO ADJUSTTWROTTLE CONTROL
CABL£
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. With engine not running, move throttle
control lever from slow to choke position.
Slowly move 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 damp
screw and move throttle cable until boles
are aligned. Tighten damp screw
securely.
2 .
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 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, turning idle mixture valve in
(dockwise) decreases the supf% of fuel to
the engine giving a leaner fuel/air mixture.
Turning the idle mixture valve out (counter-
dockwise) increases the supply of fuel to the
engine giving a richer foel/air mixture.
IMPORTANT: Damage to the needle valve
and the seat in carburetor may result if screw
is turned in too tight.
PRELIMINARY SETTING-
1. Air deaner assembly must be as­
sembled to the carburetor when making
carburetor adjustments.
2. Be sure the throttle control cable is
adjusted properly (see above).
FINAL SETTING-
1. Start engine and allow to warm for five
minutes. Make final adjustments with
engine mnning and shiftfmotion control
lever in neutral (N) position.
2. Move throttle control lever to slow
position. Wrth finger, rotate and hold
throttle lever against idle speed screw.
Turn idle speed screw to attain 1750
RPM.
3. While still holding throttle lever against
idle speed screw, turn idle mixture valve
full travel dockwise then counterdock-
wise until engine runs rough. Turn valve
to a point midway between those two
positions. Release throttle lever.
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