70 hp Johnson no spark

[Rtjoines]

I bought a crest liner 24ft pontoon boat with a 70 hp 2000 motor. I can't get any spark to the plugs. I tested the compression and its good. It gets fuel ok. It turns over very good but no spark. Any advice would be helpful.

[Joe Reeves]

I bought a crest liner 24ft pontoon boat with a 70 hp 2000 motor. I can't get any spark to the plugs. I tested the compression and its good. It gets fuel ok. It turns over very good but no spark. Any advice would be helpful.

Assuming the lanyard is on the kill switch and the kill switch is functional (off/on). Check it with a ohm meter.

Remove the black/yellow wire (kill circuit) from the ignition switch. If you now have spark, replace the ignition switch. Let us know what you find.

[Rtjoines]

Thanks for helping. I am new to boat motors and will have to learn. I cut the black/ yellow wire from the harness and also disconnected the harness from the boat.this harness had three connections not just one plug. Then i jumped the motor at the starter and still didn't get a Spark.now what can i do next?

[Joe Reeves]

To be on the "No Guessing" side, find the black/yellow wire at the powerpack that leads to the ignition switch and disconnect it from the powerpack. This eliminate the wiring harness, ignition switch, etc, in effect isolating the self contained ignition system.

Have all of the spark plugs removed to obtain the highest rpm available. THe engine must crank over at least 300 rpm in order for the stator under the flywheel to generate the proper "AC" voltage to the powerpack capacitor, needed to energize the powerpack.

A slow cranking engine will not generate spark.

Inspect the stator under the flywheel visually. If there is any sticky looking substance dripping from it down on the powerhead area, that would result in a "AC" voltage drop to the powerpack capacitor that would in turn result in weak, erratic, and eventually no ignition.

The spark must jump a 7/16" gap with a strong blue lightning like flame... a real SNAP! Note that the 7/16" gap is important.

[Rtjoines]

Thanks for this info. I will do that next. If i do disconnect the black/ yellow wire from the powerpack and still get no spark does this mean the powerpack is shot?

[Joe Reeves]

Thanks for this info. I will do that next. If i do disconnect the black/ yellow wire from the powerpack and still get no spark does this mean the powerpack is shot?

In all probability, yes... UNLESS the stator under the flywheel is melting down bad.