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11. SPARK PLUG
Checking the spark plug.
The spark plug is an important engine component, which is easy to check. Since heat and deposits
will cause any spark plug to slowly erode, the spark plug should be removed and checked in
accordance with the periodic maintenance and lubrication chart. In addition, the condition of the
spark plug can reveal the condition of the engine.
To remove the spark plug
1.
Remove spark plug wire.
2.
Remove dirt and debris from around the spark plug.
3.
Remove the spark plug with a spark plug wrench.
To check the spark plug
1.
Check that the porcelain insulator around the center electrode of the spark plug is a
medium to light tan (the ideal color when the ATV is ridden normally).
NOTE:
If the spark plug shows a distinctly different color, the engine could be operating
improperly. Do not attempt to diagnose such problems yourself. Instead have your dealer
check the ATV.
2.
Check the spark plug for electrode erosion and excessive carbon or other deposits and
replace it if necessary.
Specified spark plug:
NGK/CR7E
3.
Measure the spark plug gap with a wire thickness gauge and if necessary, adjust the gap to
specification.
Spark plug gap:
0.7~0.8 mm
To install the spark plug
1.
Clean the surface of the spark plug gasket and it’s mating surface
and then wipe off any grime from the spark plug threads.
2.
Install the spark plug with the spark plug wrench and then tighten it to the
specified torque.
Tightening torque:
Spark plug:
17.6 Nm or 13 ft. lbs. (180 kgf/cm)
NOTE:
If a torque wrench is not available when installing the spark plug, a good estimate of
the correct torque is 1/4-1/2 turn past finger tight. However the spark plug should be
tightened to the specified torque as soon as possible.
3.
Install the spark plug wire.