To Adjust Carburetor

SERVmCE AND A JUST E TS

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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:

eClose the high speed adjusting screw by hand

•Do not overtighten.

®Then open it 1-!/4 to 1-1/2 turns.

•Close the idle adjusting screw by hand. Do not overtighten.

eThen open it 1-114 to 1-112 turns.

® Start the engine and let it warm up.

eSet the throttle control to FAST. Adjust the high speed adjusting screw in until the engine speed or sound alter& 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 drop& 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 acceF erate from low speed to high speed properly, adjust the high speed screw out in 1/8 turn increments until the problem is resolved_

oLet the engine run undisturbed for 30 seconds between each setting to aitow the engine to react to the previous adjustments..

IDLE ADJUSTING SCREW

(Close finger tight only)

HIGH-SPEED ADJUSTING

SCREW

(Close finger tight only)

FIG, 37

TO ADJUST:

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

Be sure the spark plug is clean and free of foreign material. 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, WHICH IS FACTORY SET FOR PROPER ENGINE SPEED. OVERSPEED1NG 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 SERVICE CENTER, WHICH HAS THE PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS

TO ADJUST OR REPLACE

THE SPARK PLUG

If you have difficulty starting your snow thrower, you may need to adjust or replace the spark plug. Fotlow the instructions below.

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

FIG. 38

TO REPLACE:

•ff you need a new spark plug, use only the proper replacement spark plug

o Set the gap to .,030 (See Fig 38),.

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

•Tighten the plug firmly into the engine,.

oIf a torque wrench is available, torque the plug to 18 to 23 ft - ibs,