Johnson 90hp (J90PLEEB) issues
#183
Senior Member
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#184
Senior Member
Thread Starter
#185
Admirals Club 


To me , not a pro, but cylinder #1 looks like the only one that is combusting properly.
The others look flooded to me.
A nice white insulator in a 2 stroke engine raises a flag to me. JMO
They all look very oily.
The others look flooded to me.
A nice white insulator in a 2 stroke engine raises a flag to me. JMO
They all look very oily.
#187
#188
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Thread Starter

I don't really know the exact answer, however I ran the piss out of the motor before pulling out of the water. However, I then flush the motor for ~5-10mins on the muffs.
Also, I was looking back at video from when I first bought the boat last year and noticed that the motor did a lot of sneezing at low RPMs.
Also, I was looking back at video from when I first bought the boat last year and noticed that the motor did a lot of sneezing at low RPMs.
#189
Senior Member
Thread Starter

All -
Has been a couple of weeks since I was able to get out. This past Saturday, a beautiful day in the North East, I took the family out for one last time this season. Due to the swells, we stayed in the inner channel.
Not only did the motor start right up, but I was as able to troll without the motor stalling and was able to bump the throttle without issue. The wife even had commented that the motor has never run better as we did not have to constantly restart in no-wake zones.
Still would like to pull the plugs to see how each cylinder was firing.
Thanks to all who helped me learn/understand how to troubleshoot my outboard motor.
Has been a couple of weeks since I was able to get out. This past Saturday, a beautiful day in the North East, I took the family out for one last time this season. Due to the swells, we stayed in the inner channel.
Not only did the motor start right up, but I was as able to troll without the motor stalling and was able to bump the throttle without issue. The wife even had commented that the motor has never run better as we did not have to constantly restart in no-wake zones.
Still would like to pull the plugs to see how each cylinder was firing.
Thanks to all who helped me learn/understand how to troubleshoot my outboard motor.
#191
Senior Member
Thread Starter

Definitely timing was off and I think once I pulled the carbs, I should have replaced the intake manifold gasket as I believe they were original and dried out.
I also replaced the rectifier as the encapsulation rubber was wearing away.
At least now I have a backup flywheel, stator, coils and all the tools to troubleshoot.
I also replaced the rectifier as the encapsulation rubber was wearing away.
At least now I have a backup flywheel, stator, coils and all the tools to troubleshoot.
#192
Senior Member
Thread Starter

So I have about 10-18 hours on the new plugs; this is what they look like and a compression test (motor warmed up and all plugs pulled). Something that I wanted to note to anyone reading this thread, the HF compression test kit is way off vs the kit I used today.
I am no expert however, cylinder 1 looks perfect. Cylinders 2-4 might need the air/fuel mixture adjusted as the plug had excess fuel (no glazing).








I am no expert however, cylinder 1 looks perfect. Cylinders 2-4 might need the air/fuel mixture adjusted as the plug had excess fuel (no glazing).







