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Johnson 90hp (J90PLEEB) issues

Old 08-28-2020, 03:45 PM
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Use a straw on the can .
Old 08-28-2020, 04:04 PM
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Originally Posted by 1breakinit View Post
use paint and draw an arrow directly to where the spray made the revs jump .

seems you have and air leak !, just a matter of finding / pin pointing the exact source..
Old 08-28-2020, 04:05 PM
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Also this looks worn




Old 08-28-2020, 04:15 PM
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That gasket looks tired and leaky to me.

Also there is two little check valves in there on each side with a screen behind them , flush them out with carb cleaner and make sure they check flow .
Since you are in there. Sorry I can’t remember their purpose from memory .




Johnson Carburetor & Intake Manifold Parts for 1999 90hp J90PLEEB Outboard Motor

42 and 43
Old 08-28-2020, 06:09 PM
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Originally Posted by Dacman View Post
That gasket looks tired and leaky to me.

Also there is two little check valves in there on each side with a screen behind them , flush them out with carb cleaner and make sure they check flow .
Since you are in there. Sorry I canít remember their purpose from memory .




Johnson Carburetor & Intake Manifold Parts for 1999 90hp J90PLEEB Outboard Motor

42 and 43
I replaced the gasket, however just seeing your post now. I might have to order another gasket as the new ones are the rubber type, more of a paper type.
Old 08-28-2020, 06:26 PM
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I have the air mixture screws at ~7.5 turns as the motor will not stay running at 5 3/4 turns when running in a test tank.

I am looking in the manual as I donít recall seeing anything regarding double checking the timing with a timing light.

but here is a video of the motor at idle with a timing light.

Old 08-28-2020, 07:06 PM
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No need to use timing light after careful link and synch with easy timer. Did you find TDC with a dial indicator?



You may be chasing a few problems, 7.5 turns out suggests to me air bleeds, are they clean? Part #9, brass with a number scribed on it.




Idle speed seems high in videos, get that thing in a garbage can full of water for some backpressure after double-checking every step of that link and synch.

Does you command start work? Thats when idle drops as engine warms up because power pack retards timing.
Old 08-28-2020, 07:35 PM
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Originally Posted by hevysrf View Post
Did you find TDC with a dial indicator?
Yes. Checked it 3 times and TDC was spot on already.

Originally Posted by hevysrf View Post
You may be chasing a few problems, 7.5 turns out suggests to me air bleeds, are they clean? Part #9, brass with a number scribed on it.



Idle speed seems high in videos, get that thing in a garbage can full of water for some backpressure after double-checking every step of that link and synch.

Does you command start work? Thats when idle drops as engine warms up because power pack retards timing.
First, thank you for the feedback.

When I cleaned the carbs, I did let the air bleeds sit in carb cleaner, but didn't scrub them. You can see through them and they do not appear to be all gunked up. Since they are easy to access, I pull and re-clean. I also shot carb cleaner in the threaded hole when they were removed.

Yes, Idle speed was a bit high was just under 1k, I had adjusted the idle tab 1 slot, going to move the idle tab back.

The motor was running in a large plastic bin filled with water for backpressure. Should I switch to a garbage can setup?


Originally Posted by hevysrf View Post
Does you command start work? Thats when idle drops as engine warms up because power pack retards timing.
Yes, that is typically when the motor stalls out.

I think I can say that the flywheel, stator, PP, and coils are good?

Last edited by TopherMichael; 08-28-2020 at 07:42 PM.
Old 08-28-2020, 08:35 PM
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I think electrics are ok.
There is a hose from block thru pulse limiter to vro, might be vacuum leak there, maybe the decarb spray got in there and boosted rpm. Another vacuum hose to check is off small pump on vapor separator.

Bass boat central Evinrude/johnson forums have helped me tremendously. Championman, Seahorse, and 316jughead very knowledgeable, helpful.
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Old 08-29-2020, 08:44 AM
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Originally Posted by hevysrf View Post
Another vacuum hose to check is off small pump on vapor separator.
What is the vapor separator? Just donít recall reading about it in the manual.
Old 08-29-2020, 09:05 AM
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If you are still using an aftermarket CDI powerpack, I suggest replacing it with the OEM powerpack.
Old 08-29-2020, 10:12 AM
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Vapor pump is #36

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Old 08-29-2020, 10:16 AM
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Originally Posted by TopherMichael View Post
What is the vapor separator? Just donít recall reading about it in the manual.
Check out post #23 on this thread:

https://forums.iboats.com/forum/engi...page2?t=365244

Old 08-29-2020, 10:21 AM
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Originally Posted by TopherMichael View Post
What is the vapor separator? Just don’t recall reading about it in the manual.
Here is the VS



You may want to remove and check , or rebuild the primer solenoid to make sure it’s not leaking fuel thru causing a bog out at idle.
I’ll shoot you a link on how to check and rebuild in a bit.

Johnson Fuel Bracket & Components Parts for 1999 90hp J90PLEEB Outboard Motor
Old 08-29-2020, 10:24 AM
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Old 08-29-2020, 10:29 AM
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I was hoping like hell the primer solenoid was my problem as it's an easy fix. Of course it wasn't.
Old 08-29-2020, 10:58 AM
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Originally Posted by Dacman View Post
Here is the VS



You may want to remove and check , or rebuild the primer solenoid to make sure itís not leaking fuel thru causing a bog out at idle.
Iíll shoot you a link on how to check and rebuild in a bit.

Johnson Fuel Bracket & Components Parts for 1999 90hp J90PLEEB Outboard Motor
So, I am not sure if this tells me if I can eliminate the primer solenoid. When you press the key in, you do hear the solenoid engage. When the motor is running, pushing the key in, instantly causes the engine to rev higher and returns to idle when the key is not pressed in.

Looks like a simple item to take apart and check/clean.

If the rain stops today, I will head back out to check for leaks and re-soak the idle jets.


Old 08-29-2020, 12:01 PM
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Originally Posted by TopherMichael View Post
So, I am not sure if this tells me if I can eliminate the primer solenoid. When you press the key in, you do hear the solenoid engage. When the motor is running, pushing the key in, instantly causes the engine to rev higher and returns to idle when the key is not pressed in.

Looks like a simple item to take apart and check/clean.

If the rain stops today, I will head back out to check for leaks and re-soak the idle jets.
Yeh , that pretty much tells you it is working ok. Disregard. I wouldn’t take it apart without new gaskets and plate as the video shows.


I can’t remember ,

have you rebuilt those carbs , or just sprayed stuff in here and there?
Old 08-29-2020, 12:16 PM
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[QUOTE=TopherMichael;14000165] When you press the key in, you do hear the solenoid engage. When the motor is running, pushing the key in, instantly causes the engine to rev higher and returns to idle when the key is not pressed in.


This is interesting, You may indeed have a crankcase air leak problem.

When mine is warmed up, idling, quick start disengaged, idling at 600 rpms or so, if I push the key to introduce more fuel, it bogs down for a second or two then picks back up to normal idle.

Yours revs up, too much air.
Old 08-29-2020, 12:30 PM
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Originally Posted by Dacman View Post
Yeh , that pretty much tells you it is working ok. Disregard. I wouldnít take it apart without new gaskets and plate as the video shows.


I canít remember ,

have you rebuilt those carbs , or just sprayed stuff in here and there?
Fully disassembled and cleaned several times.




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