Craftsman 917.257281 Owner's Manual page 23

CE A ADJU ENT$
ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 29)
The throttle control has been preset at the factory and
adjustment shouldnot be necessary. Check adjustment as
described below before loosening cable. If adjustment is
necessary, proceed as follows:
• With engine not running, move throttle control lever
from "SLOW"to =CHOKE" position. Slowtymove lever
from =CHOKE" to "FAST" position.
o Checkthatholes"A" lngovernorcontrolleverandhole
in governor plate line-up. If holes "A" are not aligned,
loosen clamp screw and movethrottle cable untilholes
are aligned. Tighten clamp screw securely.
GOVERNOR GOVERNOR
CONTROL LEVER CONTROLPLATE
HOLES "A" CLAMP THROTTLE
SCREW CABLE
FINAL SETTING -
• Start engine and allow to warm for five minutes. Make
final adjustments with engine running and shift/motion
controllever in "NEUTRAL position°
, Move throttJe control lever to "SLOW" position. With
finger, rotate and hold throttle lever against Idlespeed
screw. Turn Idle speed screw to attain 1750 RPM.
• While still holding throttle lever against idle sReed
screw, turn idle m]xture valve In (clockwise) unUlen-
ginebegins to die and then turn out (counterclockwise)
until engine runs rough. Turn valve 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 ldle mixture
valve out (counterclockwise) llSturn. Repeattest and
continueto adjust, tf necessary, until engine acceler-
ates smoothly.
Htgh 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, IFYOU THINKTHE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
NEAREST AUTHORIZED SERVICE CENTER, WHICH HAS
PROPER EQUtPMENT AND EXPERIENCETO MAKE ANY
NECESSARY ADJ USTMENTS,
FIG, 29
TO ADJUST CARBURETOR (See Fig, 30)
The carburetor has been preset at the factory and adjust-
ment should not be necessary. However, minor adjust-
ment maybe requiredto compensatefor differences infuel,
temperature, altitude or toad. if the carburetor does need
adjustment, proceed as follows:
In general, turning idle mixture valve in (clockwise) de-
creases the supplyoffuelto the engine givinga leanerfuel/
air mixture. Turning the idle mixture valve out (counter*
clockwise)increases the supplyof fuel to the engine giving
a richer fuelialr mixture.
IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND
THE SEAT IN CARBURETOR MAY RESULT IF SCREW IS
TURNED IN TOO TtGHT_
PRELIMINARY SETTING -
• Air cleaner assembly must be assembledto the carbu-
retor when making carburetor adjustments.
• Be sure the throttle control cable is adjusted properly
(see above).
- With engine off turn Idle mixture valve In (clockwise)
closing it finger tight and then turn out (counterclock-
wise) 1 full turn.
THROTTLE IDLE SPEED
LEVER SCREW
IDLE MIXTURE
VALVE
FIG, 30
23