Re: 84 50hp electric start. lost spark, randomly came back and now gone
Remove spark plugs, disconnect the large electrical plug at the engine. Rig up something so that the spark must jump a 7/16" gap. Have the key in the ON/RUN position and crank the engine by jumping the solenoid. If you have spark with that electrical plug disconnected but none with it connected, the problem is normally a shorted ignition switch (replace it).
You can also test the switch by having that large electrical plug connected normally, then removing the Black/Yellow wire from the ignition switch. If you have spark with that wire disconnected but none with it connected = bad switch!
Also look closely under the flywheel at the stator (beginning of ignition and charging system - large circular ring).... if there is a sticky looking substance dripping from it down on the powerhead area, replace the stator. Let us know what you find.
