54
Maintenance (cont’d)
2.
Visually inspect the spark plug. Discard if the insulator is cracked or chipped. Clean the spark plug
with a wire brush if it is to be reused.
3.
Measure the plug gap with a feeler or gauge. The gap should be .07-.08mm (0.028-0.031 in).
Correct as necessary by bending the side electrode.
4.
Check that the spark plug washer is in good condition and thread the spark plug in by hand to
prevent cross-threading. If spark plug is damaged, replace with a new one.
5.
After the spark plug is seated, tighten with a spark plug wrench to compress the washer.
NOTE:
When installing a new spark plug, tighten ½ turn after the spark plug seats to compress the
washer. When reinstalling a used spark plug, tighten 1/8-1/4 turn after the spark plug seats to
compress the washer.
Idling Adjustment
1.
Start the engine and allow it to warm up to normal operating temperature.
2.
With the engine idling, turn the pilot screw in or out to the setting that produces the highest idle
rpm. Standard idling will be 1500 ± 150 rpm.
CAUTION
The spark plug must be securely tightened. An improperly tightened spark plug can
become very hot and may damage the engine.
Summary of Contents for M1577110E
Page 32: ...32 FIG04697 Parts Explosion Models 1577110 15771120 Rev E...
Page 34: ...34 Pump Exploded View Rev E...
Page 37: ...37 Engine Exploded View 1577110 Rev E...
Page 40: ...40 Engine Exploded View 15771120 Rev E...
Page 45: ...45 Parts Descriptions 15771120 ONLY 15771120 ONLY 15771120 ONLY 1577110 ONLY...
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Page 62: ...62 Assembled by Northern Tool Equipment Company Inc Burnsville MN 55306 NorthernTool com...
