Maintenance81porcelain is very white, this could indicate anintake air leak or carburetion problem in thatcylinder. Do not attempt to diagnose anyproblems yourself. Instead, take the out-board motor to a Yamaha dealer. You shouldperiodically remove and check the sparkplug because heat and deposits will causethe spark plug to slowly break down anderode.To remove the spark plug1. Remove the flywheel magnet cover afterremoving the bolt.2. Remove the ECM (Electronic ControlModule) cover.3. Remove the bolt that is securing the ig-nition coil, and then remove the ignitioncoil. NOTICE: Do not use any tools toremove or install the ignition coil.Otherwise, the ignition coil couplercould be damaged. [ECM02331]4. Remove the spark plug. WARNING!When removing or installing a sparkplug, be careful not to damage the in-sulator. A damaged insulator couldallow external sparks, which couldlead to explosion or fire. [EWM00562]1. Flywheel magnet cover2. Bolt1 2ZMU071821. ECM (Electronic Control Module) cover1. Bolt2. Ignition coil1ZMU07183211211112222ZMU06973©2017 Yamaha Motor Corporation, U.S.A.
