Spark Plugs Replacement and Adjustment

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Spark Plugs Replacement and Adjustment

Spark plugs, NGK B8ES, are used on this model.

For most riding conditions this spark plug heat range number is satisfactory. However, if the motorcycle is going to be operated for extended periods at high speeds and near maximum power in hot climates, the spark plugs should be changed to a colder heat range number, such as the NGK B10E (option) or its equivalent.

Spark plug cleaning and adjustment is done in the following manner.

Detach the high tension cord cap and remove the spark plugs with the spark plug wrench provided in the tool kit.
Inspect the electrodes and center porcelain of the spark plug for deposits, eroded electrodes, or carbon fouling. If the spark plugs deposits are heavy, or the electrodes appear to be eroded excessively, replace the spark plug with a new one. If the spark plug is carbon or wet fouled, the plug can sometimes be cleaned with a stiff wire brush.
Adjust the spark plug gap (1) to 0.028•0.032 in. (0.7-0.8 mm). The gap can be measured with a feeler gauge. The adjustment is made by bending the negative (grounded) electrode (2)
When installing the spark plug, tighten firmly, but do not overtighten.

NOTE:

All spark plugs must be tight. An improperly tightened plug can become very hot and possibly cause damage to the engine.
Never use an improper heat range spark plug.
Do not attempt to dry or remove soot from the spark plug by burning.

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