Spark Plug Inspection
Spark plug condition is indicative of engine operation. The spark plug firing end condition should be read after the engine is warmed up and the vehicle is driven at higher speeds. Immediately check the spark plug for correct color.
CAUTION
A hot exhaust system and engine can cause burns.
Wear protective gloves when removing a spark plug for inspection.
To inspect the spark plug 1, do the following: 
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Lift the cargo box to access the spark plug.
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Remove the spark plug cap. Using the spark plug wrench provided in the tool kit, remove the plug by rotating it counter-clockwise.
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Reverse the procedure for spark plug installation.
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Torque to specification.
NOTICE
When reinstalling the spark plug boot onto the
spark plug, be sure to place a small amount of dielectric grease in
the spark plug boot.