Yamaha XJ 550 discussion forum:

RE: Burnt Spark Plugs

RE: Burnt Spark Plugs

Daniel T. Shell said 2007-12-13 18:28

It sounds like your plugs are carbon fouled.
Appearance-Dull dry black with fluffy carbon deposits on the insulator tip, electrode and exposed shell.
Caused by-Fuel/air mixture too rich, pulg heat range too cold, weak ignition system, dirty air cleaner. Hope this helps.

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