Sears 580.75151 manual Service, Engine Adjustments, Carburetor

CUSTOMER RESPONSiBILITiES

CLEAN COOUNG SYSTEM

•Clean dirt or chaff from finger 0uard or rotating screen even] 8 hours to prevent engine damage caused by ovedleating (Fig. 25),

=Keep dirt and combustible debris off of muffler area.

REPLACE SPARK PLUG

Change the spark plug every 100 hou rs of operation or' once each year, whichever comes first, This will help engine to start easier and run better. See pressure washer specifications for the type of spark plug you need. Spark plug gap is 0.030 inch (0.76mm).

FIG.

CLEAN OUT CHAFFAND DIRT

SERVICE AND

ENGINE ADJUSTMENTS

Carburetor:

Differences in fuel, temperature, altitude or load may re-

quire minor carburetor adjustment. Air cleaner and air cleaner cover must be assembled to carburetor before

starting engine.

INITIAL ADJUSTMENT

•Gently turn NEEDLE VALVE (Fig 26) clockwise until it just closes_ Valve may be damaged by turning it inward too far,

IDLE SPEED	THROTTLE
ADJUSTING SCREW	STOP

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ADJUSTMENTS

°Next open NEEDLE VALVE 1.1/2 turns counterclock- wise.

=This initial adjustment will permit the engine to be started and warmed up.

FINAL ADJUSTMENT

oStart engine and let itwarm up for at least five minutes.

°With engine running, turn NEEDLE VALVE inward

(clockwise - lean mixture) until engine just starts to slow=

Engine Speed:

WARNING: NEVER TAMPER WITH ENGINE GOV- ERNOR WHICH IS FACTORY SET FOR PROPER

ENGINE SPEED. OVERSPEEDING ENGINE ABOVE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS.

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THROTTLE NEEDLE VALVE

FIG. 26

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