Yamaha F20B Owner's Manual

Also see for F-20B: Owner's manual Owner's manual Service manual Owner's manual Installation manual

Contents

Maintenance68other 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 rotatingparts while the engine is running.NOTICEECM00490This procedure must be performed whilethe outboard motor is in the water. Aflushing attachment or test tank can beused.If the boat is not equipped with a tachometerfor the outboard motor, use a diagnostic ta-chometer for this procedure. Results mayvary depending on whether testing is con-ducted with the flushing attachment, in a testStandard spark plug:DPR6EB-91. Spark plug gap2. Spark plug part number3. Spark plug I.D. mark (NGK)Spark plug gap:0.8–0.9 mm (0.031–0.035 in)Spark plug torque:18.0 Nm (1.84 kgf-m, 13.3 ft-lb)ZMU06169