Sears 917.25667 - Manual (Page 27)

SERVICE AND ADJUSTMENTS
TO ADJUST CHOKE CONTROL (See Fig. 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 pane!) to full choke (N) position.
» Remove air cleaner cover, filter and cartridge plate to
expose carburetor choke (see "AIR FILTER" in the
Customer Responsibilities section ot 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 damp screw se­
curely.
" Reassemble air cleaner.
TO ADJUST CARBURETOR (See Figs. 36 &
37)
The carburetor has been preset at the factory and adjust­
ment should not be necessary. However, minor adjust­
ment may be required to compensate fordifferencesinfuel,
temperature, altitude or load. If the carburetor does need
adjustment, proceed as follows:
In general, turning the mixture screw in (dockwise) de­
creases the supply of fuel to the engine giving a leaner fuel/
air mixture , Turning the mixture screw out (counterciock-
wise) 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 !S
TURNED IN TOO TIGHT
PRELIMINARY SETTING -
• Be sure you have a dean air filter, and the throttle
control cable and choke are adjusted properly (see
above).
® 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 allow to warm for five minutes. Make
final adjustments with engine running and shift/ motion
control lever in neutral (N) position.
With throttle control lever in slow (*») position, hold
throttle lever against idie speed screw and adjust idle
speed screw to obtain 1200 to 1400 RPM
While still holding throttie lever against idle speed
screw, turn idle mixture screw in (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.
Release throttle lever.
ACCELERATION TEST -
« Move throttle control lever from slow («») 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 accel­
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
ENGINESPEED OVERSPEEDING THE ENQINEABOVE
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