50hp johnson no fire

[sambrigman]

I have a 73 50hp johnson, it has set up a while. Turns over good, NO FIRE to either plugs, where do I look. I do have ignition to the fuse link. Any ideas would be appreciated. Thanks Guys.

 

[oldcatamount]

Re: 50hp johnson no fire

Did you check the fuse? She's probably going to need some ignition work ie: points, condensers, coils, plugs and plug wires. Check the compression first (before you spend any money). If that's good, the other stuff isn't that expensive and you can install it yourself.

 

[kenmyfam]

Re: 50hp johnson no fire

Lanyard ??? if it has one. Quick and easy check

 

[58rude]

Re: 50hp johnson no fire

Kill switch and lanyard if it has one. Kill switch got me on my new boat.

 

[boobie]

Re: 50hp johnson no fire

The 73 50 hp has mag cd, not points,condensers and ect. The first thing you should do is find a Black/Yellow wire going to your power pack and disconnect that from the pack. You may have to remove the pack cover if you still have one. This elimates the boat wiring system and if you still have no spark you'll have to trouble shoot the ignition system on the mtr. Spark should jump a 7/16 " open air gap. Also check the compression first as Oldcat said to make sure you have something to work with.

 

[carbineone]

Re: 50hp johnson no fire

I have the same motor and the same problem.I have messed with it off and on and have come to the conclusion its either the stator or the trigger I think they call it..If you figure out what your problem is let me know...Thanks

 

[Joe Reeves]

Re: 50hp johnson no fire

That engine must turn over at least 300 rpm in order for the stator under the flywheel to energize the powerpack/ignition. Spark is always to be tested with the spark plugs removed.

If you're doing the above and still having no spark, disconnect the large RED electrical cable at the engine, then crank the engine testing for spark by jumping the starter solenoid. If you now have spark, the usual problem is a shorted ignition switch. If still no spark, it's usually a failed powerpack.