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EJU21300
Cleaning and adjusting the spark plugs
The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate something about the condition of the engine. For example, if one spark plug shows a distinctly different color, the engine could be defec- tive. Do not attempt to diagnose any problems yourself. Have a Yamaha dealer service the watercraft.
Remove and inspect the spark plugs peri- odically; heat and deposits will cause the spark plugs to slowly break down and erode. If electrode erosion becomes excessive, or if carbon and other deposits are excessive, replace the spark plug with the specified plug.
Specified spark plug: NGK CR9EB
To remove a spark plug:
1.Remove the seat. (See page
2.Remove the spark plug cap.
CAUTION:
Do not use any tools to remove or install the spark plug cap, otherwise the ignition coil coupler may be damaged. The spark plug cap may be difficult to remove because the rubber seal on the end of the cap fits tightly. To remove the spark plug cap, simply twist it back and forth while pulling it up; to install it, twist it back and forth while pushing it down.
3. Remove the spark plug.