Craftsman EZ3 917.259573 Owner's Manual page 27

SERVICE AND ADJUSTMENTS
TO ADJUST CHOKE CONTROL (See Fig. 33)
The choke control has been preset at the factory and
adjustment should not be necessary. Checkadjustment as
described below before loosening cable, tf adjustment is
necessary, proceed as follows:
• With engine not running, move choke control (located
on dash pane!) 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,
CHOKE
CLOSED
c,,,,o
CLAMP
SCREW
FIG, 33
TO ADJUST CARBURETOR (See Figs. 34 &
35)
The carburetor has been preset at the factory and adjust-
ment should r_ot be necessary. However, minor adjust-
ment may be required to compensate for differences in fue!,
temperature, attitude or load, If the carburetor does need
adjustment, proceed as follows:
In general, turning the mixture screw in (clockwise) de-
creases the supply of fuel to the engine giving a leaner fuel/
air mixture. Turning themixture screw out (counterclock-
wise) increases the supply of fuel to the engine giving a
richer fuel/air mixture.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS 1N CARBURETOR MAY RESULT 1F SCREW tS
TURNED IN TOO TIGHT.
pRELIMINARY SETTING -
• Be sure you have a clean air filter, and the throttle
control cable and choke are adjusted properly (see
above),
o With engine off turn idle mixture screw in (clockwise)
closing it finger tight and then turn out (counterclock-
wise) 1-1/4 to 1-1/2 turns,
FINAL SETTING -
• Start engine and ai]ow to warm for five minutes. Make
final adjustments with engine running and shift/motion
contro! leve( in neutral (N) position. •
- With throttle control lever in slow position, hold throttle
lever against idle speed screw and adjust idle speed
screw to obtain t200 to !400 RPM.
• While still holding throttle lever against idle speed
screw, turn idle mixture screw _n (clockwise) until
engine begins to die and then turn out (counterclock-
wise) until engine runs rough. Turn screw to a point
midway between those two positions,
o Continue to hold throttle lever against idle speed screw
and adjust idle speed screw to obtain 900 to ! 200 RPM,
Release throttle lever.
ACCELERATION TEST -
Move throttle control lever from show to fast position. If
engine hesitates or dies, turn idle mixture screw out
(counterclockwise) 1/8 turn. Repeat test and continue
to adjust, if necessary, until engine acce!erates
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.
IDLE SPEED
SCREW
IDLEMIXTURE
SCREW
THROTTLE
LEVER
FIG. 34
IDLE SPEED
sCREW
THROTTLE /
LEVER
IDLE MIXTURE
SCREW
27 FIG. 35