Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 38Get this manual
BF50BF5A bINSPECTION IGNITION COIL
Primary coil Measure the resistance between the wire terminal and the corePRIMARY COIL RESISTANCE
Secondary coil Remove the spark plug cap from the spark plug lead and measure the resistance between the core and the spark plug lead
ENGINE SWITCH
Check for continuity between the primary wire (BIA) and ground wire (81) when the switch is depressedSWITCH POSrTiON DEPRESSED RELEASED CONTINUITY NO CONTINUITY