Sears 536.884811 owner manual To Adjust Carburetor, To Adjust or Replace Spark Plug, To Replace

S RVICE AN ADJUST E TS

TO ADJUST CARBURETOR

The carburetor (See Fig. 37) has been pre-set at the factory and readjustment should not be necessary.. However, if the carburetor does need to be adjusted, proceed as follows:

®Close the high speed adjusting screw by hand..

®Do not overtighteno

o Then open it 1-1/4 to 1-1/2 turns°

®Close the id)e adjusting screw by hand, Do not overtighten.

oThen open it 1-1/4 to 1-1/2 turns_

®Start the engine and let it warm up,

oSet the throttle control to FAST. Adjust the high speed adjusting screw in until the engine speed or sound alters° Adjust the screw out until the engine

speed sound alters. Note the difference between the two limits and set the screw in the middle of the

range..

eSet the throttle control to SLOW,. Adjust the idle adjusting screw in until the engine speed drops, then adjust the screw out until the engine speed drops. Note the difference between the two limits and set the screw in the middle of the range..

®If the engine tends to stall under load or not accel- erate from low speed to high speed properly, adjust the high speed screw out in 1/8 turn increments until the problem is resolved°

®Let the engine run undisturbed for 30 seconds between each setting to allow the engine to react to the previous adjustments.

_IDLE ADJUSTING SCREW

_:j- (Close finger tight only)

(Close finger tight only)

i i Hl=,,Hll ,l= ,

FIG. 37

TO ADJUST:

eClean the spark plug by carefully scraping elec- trodes (do not sand blast or use a wire brush)_

oBe sure the spark plug is clean and free of foreign matedaL Check electrodes gap (See Fig. 38) with a wire feeler gauge and reset the gap to 030 inch if necessary_

.030 GAP

IMPORTANT: NEVER TAMPER WITH THE ENGINE GOVERNOR, WHlCH IS FACTORY SET FOR PROPER ENGINE SPEED. OVERSPEEDING THE ENGINE ABOVE THE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS.

IF YOU THINK THE ENGINE GOVERNED HIGH SPEED NEEDS ADJUSTING, CONTACT YOU R NEAREST SEARS SERVICE CENTER, WHICH HAS THE PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS,.

TO ADJUST OR REPLACE

THE SPARK PLUG

FIG. 38

TO REPLACE:

eIf you need a new spark plug, use only the proper replacement spark plug.

eSet the gap to _030(See Fig 38).

oBefore installing the spark plug, coat its threads lightly with graphite grease to insure easy removal

•Tighten the plug firmly into the engine,

•Ifa torque wrench is available, to rque the plug to 18 to 23 ft - Ibs

If you have difficulty starting you r snowthrower, you may need to adjust or replace the spark plug. Follow the instructions below.

Replace the spark plug it electrodes are pitted or burned or if the porcelain is cracked

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