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Maintenance, Spark plug cooling system – Shindaiwa X7501920500 User Manual

Page 15

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15

0.6mm

(0.024 in.)

CAUTION!
Never allow dirt or debris to enter the cylinder bore! Before remov-

ing the spark plug, thoroughly clean the spark plug and cylinder head

area! Allow the engine to cool before servicing the spark plug! Cylinder

threads can be damaged by tightening or loosening the spark plug while

the engine is hot!

Clean the spark plug

and check the gap

at the electrode.

Figure 14

NGK CMR5H

Counter-

clockwise

to remove.

1. Use the spark plug wrench to remove the spark plug. See Figure 14.
2. Clean and adjust the spark plug gap

to 0.6mm (0.024 in.). If the plug must be replaced, use a NGK CMR5H

or equivalent type plug of the correct

heat range.

3. Install the spark plug finger-tight in the cylinder head, then tighten it

firmly with the spark plug wrench. If a torque wrench is available, torque

the spark plug to 16.7-18.6 Nm (148-165 inch-pounds)

Spark Plug

Cooling System

CAUTION!
The engine is cooled by air drawn into the air intake cover on the blower

housing. The blower fan then pushes the cooling air through an opening in

the fan housing, forcing it past the cylinder cooling fins. Failure to keep the

cooling system and its passages clear of debris will likely result in engine

overheating, a major cause of serious engine problems that can lead to

failure.

• Remove all dirt and debris from blower exterior and the engine. Check the

cooling fins and air cleaner for clogging and clean as necessary.

1. Remove engine cover.
2. Clean cylinder fins to allow cooling air to pass freely.

• Carefully remove any accumulations of dirt or debris from the muffler and

fuel tank. Dirt build-up in these areas can lead to engine overheating, fire

or premature wear.