To Adjust Throttle Control Cable; To Adjust Carburetor; Preliminary Setting; Final Setting - Craftsman 917.254530 Owner's Manual

ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 32)
The throttle control has been preset at the factory and
adjustment should not be necessary+ Checkadjustment as
described below before loosening cable+ If adjustment is
necessary, proceed as follows:
• With ,engine,,no!, runningl, move throttle control lever
from ,SLOW !o CHOKE position. SIowlymove lever
from CHOKE to FAST position+
• Check that hole in governor control lever and hole in
governor plate fine-up, If holes "A" are not aligned,
loosen clampscrew and move throttle cable until holes
are aligned Tighten clamp screw securely,
TO ADJUST CARBURETOR (See Fig. 32)
The carburetor has been preset at the factory and adjust-
ment should not be necessary However, minor adjust-
ment 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 mixture screws in (clockwise) de-
creases the supply of fuel to the engine giving a eaner fue /
air mixture+ Turning the mixture screws out (counter-
clockwise) 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 SCREWS
ARE TURNED IN TOO TIGHT,
PRELIMINARY SETTING +
• Air cteaner assembly must be assembled to the carbu+
retor when making carburetor adjustments.
. Be sure the throttle control cable is adjusted properly
(see above)
• With engine off turn high speed mixture screw in
(clockwise) closing it finger tight and then turn out
(counterclockwise) 1+1/4 to t-1/2 turns.
• Turn idle mixture screw in (clockwise) closing finger
tight and then turn out (counterclockwise) 1 turn
FINAL SETTING -
• Start engine and allow to warm for five minutes, Make
final adjustmen!s with engine running and shift!motion
control lever in NEUTRAL position.
• With throttle controt lever in "FAST" position, turn high
speed mixture screw in (clockwise) until engine begins
to die then turn out (counterclockwise) untit engine runs
rough_ Turn screw to a point midway between those
two positions.
• With throttle controt lever in "SLOW" position, turn idle
mixture screw in (clockwise) until engine begins to die
and then turn out (counterclockwise) until engine runs
rough. Turn screw to a point midway between those
two positions
GOVERNED IDLE -
. Move throttle control lever to "SLOW" position+ With
finger hold throttle shaft in closed position against
throttle stop (counterclockwise) Turn idle speed screw
to attain 1550 RPM. Release throttle shaft, Move
throttle control lever to attain t 750 RPM+Turn governor
idle screw until it contacts governor control lever.
ACCELERATION TEST +
• Move throttle control lever from "SLOW" to "FAST"
position_ tf 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
ENGINE SPEED. OVERSPEEDtNG THE ENGINE ABOVE
THE FACTORY HIGH SPEED SETTING CAN BE
DANGEROUS. IFYOU THINKTHE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
NEARESTAUTHORIZED SERVICE CENTER, WHICH HAS
PROPER EQUIPMENTAND EXPERIENCE TO MAKE ANY
NECESSARY ADJUSTMENTS,,
IDLE SPEED
SCREW THROTTLE
"\ SHAFT
IDLE MIXTURE
SCREW
THROI_LE
CABLE
GOVERNOR HOLES "A"
HIGH SPEED CONTROL GOVERNOR
MIXTURE SCREW LEVER CONTROL
PLATE
FIG. 32
24