Yamaha 20D Owner's Manual

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Contents

Maintenance58move and inspect the spark plug becauseheat and deposits will cause the spark plugto slowly break down and erode.1. Remove the spark plug caps from thespark plugs.2. Remove the spark plug. If electrode ero-sion becomes excessive, or if carbonand other deposits are excessive, youshould replace the spark plug with an-other of the correct type. 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. [EWM00561]3. 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.4. When fitting the plug, wipe off any dirtfrom the threads, and then screw it in tothe correct torque.TIP:If a torque-wrench is not available when youare fitting a spark plug, a good estimate ofthe correct torque is 1/4 to 1/2 a turn past fin-ger-tight. Have the spark plug adjusted to thecorrect torque as soon as possible with atorque-wrench.EMU37450Checking fuel filterCheck the fuel filter periodically. If any wateror foreign matter is found in the filter, clean orreplace it. For cleaning or replacement of thefuel filter, consult your Yamaha dealer.EMU29043Inspecting idling speedWARNINGEWM00451 Do not touch or remove electrical partswhen starting or during operation. Keep hands, hair, and clothes awayfrom the flywheel and other rotatingStandard spark plug:BR7HS-101. Spark plug gap2. Spark plug I.D. mark (NGK)3. Spark plug part numberSpark plug gap:0.9–1.0 mm (0.035–0.039 in)Spark plug torque:25.0 Nm (2.55 kgf-m, 18.4 ft-lb)ZMU06140