Yamaha FL200A Owner's Manual

Also see for F200A: Rigging guide Supplementary service manual

4-23GBEMU01035CLEANING AND ADJUSTING SPARKPLUGWARNING@When removing or installing a sparkplug, be careful not to damage the insu-lator. A damaged insulator could allowexternal sparks, which could lead toexplosion or fire.@The spark plug is an important engine com-ponent and is easy to inspect. The conditionof the spark plug can indicate somethingabout the condition of the engine. For exam-ple, if the center electrode porcelain is verywhite, this could indicate an intake air leakor carburetion problem in that cylinder. Donot attempt to diagnose any problems your-self. Instead, take the outboard motor to aYamaha dealer. You should periodicallyremove and inspect the spark plug becauseheat and deposits will cause the spark plugto slowly break down and erode. If electrodeerosion becomes excessive, or if carbon andother deposits are excessive, you shouldreplace the spark plug with another of thecorrect type.Before fitting the spark plug, measure theelectrode gap with a wire thickness gauge;adjust the gap to specification if necessary.Standard spark plug:Refer to “SPECIFICATIONS”, page 4-1.Spark plug gap:Refer to “SPECIFICATIONS”, page 4-1.