Craftsman 917.258911 - Manual (Page 27)

SERVICE AND ADJUSTMENTS
RG. 34
TO ADJUST CHOKE CONTROL
(See Figs. 34 and 35)
The choke 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:
• With engine not running, move choke control (located
on dash panel) to full choke position,
• Remove air cleaner cover, filter and cartridge plate to
expose carburetor choke (See "AIR FILTER" in the
Customer Responsibilities section of this manual).
• Choke should be closed, if it is not, loosen casing
clamp screw and move choke cable until choke is
completely closed. Tighten casing clamp screw se­
curely.
• Reassemble air cleaner.
TO ADJUST CARBURETOR (See Fig. 34)
The carburetor has been present at the factory and adjust­
ment 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 (ciockwise)
decreases the stjpply of fuel to the engine giving a leaner
fuel/air mixture. Turning the adjusting needles out (coun­
terclockwise) 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 SCREW IS
TURNED IN TOO TIGHT.
PRELIMINARY SETTING-
• Be sure you have a clean air filter, and the throttle
control cable is adjusted properly (see TO ADJUST
THROTTLE CONTROL CABLE" in the Service and
Adjustments section of this manual).,
• With engine off turn idle fuel adjusting needle in (ciock­
wise) closing it finger tight and then turn out (counter­
clockwise) 1 turn.
FINAL SETTING -
• Start engine and allow to warm for five minutes. Make
final adjustments with engine running and shift/motion
control lever in neutral (N) position.
• The high Idle is set at the factory and cannot be
adjusted.
• Idle speed setting - With throttle control lever in slow
position, engine should idle at 1200 RPM. If engine
idles too slow orfast, 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 adjusting needle in (clock­
wise) until engine speed decreases and then turn out
(counterclockwise) approximately 3/4 turn to obtain the
best low speed performance.
• 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 con­
tinue 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.
27