2. Before removing the spark plugs, first mark the location of the high voltage wires by cylinder numbers if they are not marked
3. Pull the high voltage wire clamps off the spark plugs (photo).
4. Using a spark plug wrench, unscrew each spark plug and remove them (photo).
5. By the condition of the spark plugs, you can judge the condition of the engine.
6. If the nose of the spark plug insulator is clean and white with no deposits, this indicates a weak mixture or too hot spark plug.
7. If the tip and nose of the insulator are covered with hard black deposits, then this indicates that the mixture is too rich. If the spark plug is black and oily, the engine is probably badly worn.
8. If the nose of the insulator is covered with light brown carbon deposits, the mixture is correct and the engine is in good condition.
9. The gap of the spark plug is important: if it is too large or too small, the ignition spark size and efficiency will be small. The spark plug gap must be set according to Specifications at the beginning of this Section.
10. To set the gap, measure it with a feeler gauge, and then bend the outer electrode of the spark plug to the desired gap.
11. Screw in the spark plugs by hand, tighten them to the tightening torque specified in Specifications.
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