Yamaha F200B Owner's Manual

Also see for F200B: Rigging guide Owner's manual Service manual

Contents

Maintenance64EMU30778Cleaning and adjusting spark plugThe spark plug is an important engine compo-nent and is easy to inspect. The condition ofthe spark plug can indicate something aboutthe condition of the engine. For example, if thecenter electrode porcelain is very white, thiscould indicate an intake air leak or carburetionproblem in that cylinder. Do not attempt to di-agnose any problems yourself. Instead, takethe outboard motor to a Yamaha dealer. Youshould periodically remove and inspect thespark plug because heat and deposits willcause the spark plug to slowly break downand erode.1. Remove the bolts to remove the ECM(Electronic control module) cover.2. Remove the bolts that are securing theignition coil, and then remove the ignitioncoil. Do not use any tools to remove or in-stall the ignition coil, otherwise the igni-tion coil coupler may get damaged.3. Remove the spark plug. If electrode ero-sion becomes excessive, or if carbon andother deposits are excessive, you shouldreplace the spark plug with another of thecorrect type. WARNING! When remov-ing or installing a spark plug, be care-ful not to damage the insulator. Adamaged insulator could allow exter-nal sparks, which could lead to explo-sion or fire. [EWM00561]4. Be sure to use the specified spark plug,otherwise the engine may not operateproperly. Before fitting the spark plug,measure the electrode gap with a wirethickness gauge; replace it if out of spec-ification.1. Bolts2. ECM (Electronic Control Module) cover1. Bolts2. Ignition coilStandard spark plug:LFR6A-11