Spark Plug

CAUTION!

Never allow dirt or debris to enter the cylinder bore! Before removing 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!

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)

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.

Counter-

clockwise to remove.

 

Clean the spark plug

 

and check the gap

0.6mm

at the electrode.

(0.024 in.)

 

Figure 14

NGK CMR5H

15