Engine; To Adjust Throttle Control Cable; To Adjust Carburetor; Preliminary Setting - Craftsman 917.298560 Owner's Manual

AND ADJUSTIVl
ENGINE
TO ADJUST THROTTLE CONrlFROL CABLE
(See Fig. 27)
o Loosen cable clamp screw to allow cable to move.
o Move throttle control lever on upper handle to "FAST"
position°
. Pull throttle cable out untilengine be!lcrank is back as
far as it wilt go.
. Hold cable in this position and tighten clamp screw
securely.
CLAMP SCREW
THROTTLE
CABLE,
BELLCRANK
FIG. 27
TO ADJUST CARBURETOR (See Fig. 28)
The carburetor has a high speed jet and has been preset at
the factory and adjustment shoutdnotbe necessary. How-
ever, minor' adjustments 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 idle needle valve in (clockwise)
decreases the supply of fuel to the engine givinga leaner
fueVair mkture. Turning the needle valve out (counter-
clockwise) increases the supplyof fuel to the engine giving
a richer fueVair mixture.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT IF SCREWS
ARE TURNED IN TOO TIGHT.
PRELIMINARY SETTING
o Air cleaner assembly must be assembled tothe carbu-
retor when making carburetor adjustments°
o Be sure the throttle control cable is adjusted properly
(see above).
• With engine off, turn idle needle valve in (clockwise)
closing it finger tight and then turn valve out (counter-
clockwise) 1-1/2 tUmSo
FINAL SETTING
° Start engine and allow to warm for five minutes,, Make
final adjustmentswith engine runningat idle and drive
controlbar in "DISENGAGED" position.
• With throttlecontrol lever in "SLOW" position,turn idle
needle valve in (clockwise) until engine beginsto die
then turn out (bounterclockwise) until encinerg'nuns
rough. Turn valveto a point midway between those two
positions.
IDLE RPM ADJUSTMENT
° To adjust idle RPM, rotate throttle linkage counter-
clockwise and hold against stop while adjusting idle
speed adjustingscrew to obtain 1750 RPM. Release
throttle linkage.
ACCELERATION TEST
• Move throttle control lever from "SLOW'' to "FAST"
position. If engine hesitates or dies, turn needle valve
out (counterclockwise) 1/8 turn. Repeat test and
continue to adjust, if necessary, until engine acceler-
ates smoothly.
High speed stop is factory adjusted,. Do not adjust or
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. IF YOU THINK THE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING.CONTACT YOUR
NEAREST SEARS SERV[CE CENTER, WHICH HAS
PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY
NECESSARY ADJUSTMENTS.
THROTTLEUNKAGE
THROTTLE STOP
IDLE SPEED /
ADJUSTINGSCREW
IDLE NEEDLE VALVE
FIG. 28
18