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any marine mechanics here?


Lunatic

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Well my awesome motor has kept me off the water yet again.

if anyone can help or suggest anything im all ears and eyes!

 

motor - 1990 20hp johnson pull start

 

problem- started up ran fine for 10 min or so,parked it,next morning it wont start and hasnt since.

 

problem - no spark

 

replaced - charge coil,power pack

 

problem - no spark

 

only thing left are the two coils,but i have a really,really hard time believing 2 coils would die at the same time.

i've looked over the wires and do not see any visible breaks.

what am i missing?

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.. a broken wire to the stop button, or a faulty stop switch. Looking at wires does nothing, get an ohm meter on them to check for continuity.

oh ya,should have mentioned i did this. that was the first thing i did before throwing parts at it.

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No spark, has to be a short in the kill switch wires or coils are gone. My bet would be a short in the kill switch wire. When you say no spark, how did you test for it? You need to test for a short in the kill switch wire. There might also be a safety where if the motor is in gear it won't start. That would be my second thing to check.

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No spark, has to be a short in the kill switch wires or coils are gone. My bet would be a short in the kill switch wire. When you say no spark, how did you test for it? You need to test for a short in the kill switch wire. There might also be a safety where if the motor is in gear it won't start. That would be my second thing to check.

i checked the kill switch wire with ohm meter and it worked fine. i had motor in neutral,during all attempts.im pretty sure if its in gear it wont allow me to pull the cord,it locks up.

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Found this info on another board. Might be of some help to you

 

 

1990 20 hp Johnson igniton problems

 

 

 

originally your engine had the UFI Ignition < at least one member fondly refers to it as the U Find It Ignition >.and OMC only used it for 4 years. The big difference in it and the usual CDI ignition on the 2 cylinder models is that the trigger sensor and powerpack are in a single unit and it's located under the flywheel along with the power coil. Prior to and after the 89 - 92 model years the powerpack was external to the flywheel < trigger sensor and power coil still under the flywheel>. You may have to get the OMC workshop manual to actually diagnose which component is failing. Marineengine dot com has diagrams of your motor. CDI electronics troubleshooting guide may also have a chart for diagnosing this system, but that's going to require a multimeter capable of reading dva.or a dva adapter for your mm.

It's highly unlikely that both external coils would quit at the same time so I'd look to that powerpack/trigger combo, or the power coil.I'd be hesitant to tell you to replace either on mere speculation, however were it mine, I'd replace all the ignition components under the flywheel.

If someone has already converted the UFI system and the power pack is mounted on the side of the block..post back and we'll look

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Hey Lunatic although I don't know what the problem is with your motor I can point you to this website for help. Www.marineengine.com The website has every motor conceivably for boats and broken up by manufacture. Good luck. Pidge.

Edited by pidge
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thats for all suggestions. i looked at an exploded diagram of my motor and the only electric parts left on the motor are the coils. as for the magnets they have a very slight score on them due to me putting the charge coil in and it rubbed up on the magnets,so the coil was replaced again as precaution. magnets seem fine?

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So your motor is 23 years old and you are going to switch brands,let me tell you there isn't anything in that motor that's in a new Johnson.Friends of mine have had the newer ones for 10 plus years of dead reliability and i want one.

 

vance

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Maybe you have a faulty kill switch? You can try disconnecting the black/yellow wire that runs into the powerpack (the kill wire) to isolate the lanyard and stop switches. I would certainly do this and not just replace the switch. Start/stop switch cost me $200 for my 96 Evinrude.

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So your motor is 23 years old and you are going to switch brands,let me tell you there isn't anything in that motor that's in a new Johnson.Friends of mine have had the newer ones for 10 plus years of dead reliability and i want one.

 

vance

 

I don't think there are any more new Johnson's as the brand has been discontinued. If any of your friends have a four stroke Johnson, then they are running a Suzuki.

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