Craftsman 917.25736 owner manual Engine, To Adjust Throttle Control Cable See Fig, Final Setting

SERVICE AND

ENGINE

TO ADJUST THROTTLE CONTROL CABLE (See Fig. 36)

The throttle control has been preset at the factory and ad- ustment should not be necessary Check ad ustment as described below before oosen ng cab e fad ustment s necessary, proceed as follows:

With engine not running, move throttle control lever from "SLOW" to "CHOKE" position Slowly move lever from "CHOKE" to "FAST" position

Check that hole in governor control lever and hole in governor plate line-up If holes "A" are not aligned, loosen clamp screw and move throttle cable until holes are aligned Tighten clamp screw securely

TO ADJUST CARBURETOR (See Fig. 36)

The carburetor has been preset at the factory and adiust- ment should not be necessary However, minor adjust- ment may be required to corn pensate 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 leaner fuel/ air mixture Turning the mixture screws 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 IN CARBURETOR MAY RESULT IF SCREWS ARE TURNED IN TOO TIGHT

PRELIMINARY SETTING -

Air cleaner 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 1-1/2 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 ad ustments with engine running and shift/motion centre ever n 'NEUTRAL" post on

With throttIe control lever in "FAST" position, turn high speed mixture screw in (clockwise) until engine begins to die then turn out (counterclockwise) until engine runs rough Turn screw to a point midway between those two positions

With throttle control 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

ADJUSTMENTS

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 1750 RPM. Turn governor idle screw until it contacts governor control lever.

ACCELERATION TEST.

Move throttle control lever from "SLOW" to "FAST"

position. If engine hesitates or dies, turn idle mixture screw out (counterclockwise) 118 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. OVER-

SPEEDING THE ENGINE ABOVE THE

FACTORY HIGH SPEED SE_ING CAN

BE DANGEROUS IF YOU THINK THE

ENGINE-GOVERNED HIGH SPEED

NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE

CENTER, WHICH HAS PROPER EQUIP-

MENTAND EXPERIENCETO MAKE ANY NECESSARY ADJUSTMENTS

IDLE SPEED

SCREWTHROTTLE

\

IDLE MIXTURE

SCREW

THROTTLE

CABLE

RNOR

LEVERHOLES'A"

HIGH SPEED

MIXTURE SCREWGOVERNOR

CONTROL

PLATE

FIG. 36

25