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Johnson 90hp (J90PLEEB) issues

Old 08-20-2020, 10:03 PM
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Originally Posted by TopherMichael View Post
I replaced the PP, optical sensor today, and all plug wires. I also, re-cleaned that 1 carb and the throttle body (this makes 5x cleaning that carb).

Honestly, I am starting to think the issue is in my head.

With the needle valve turned out to 5 3/4 (each carb), the motor fires right up. No sneezing or rough idle, however a bit sluggish when you tap the throttle but idles right back down.

Again, I pulled the starboard bottom plug and zero difference in RPMs (total head-scratcher). Sprayed premix gas into the throttle body and she took it like a champ, revved right up. I know the carb is supplying fuel as the plug is wet, just not sure why pulling the plug does not change the RPM's.

Questions...

1) How do you raise the idle once the motor is up to temp?

2) Which cylinder would be the 1 cylinder? I have a timing light, just unsure which cylinder is the 1.

Will post a video of the motor soon.

Thanks in advance for all the suggestions and help.

Have you tried swapping the starboard bottom coil with a different one and seeing if the problem moves with the coil? Swap the Plug Wires, Swap the carburetor? If a componant is causing the miss then the problem should move when you move that component.
Old 08-20-2020, 10:17 PM
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Originally Posted by Cable Mariner View Post
Have you tried swapping the starboard bottom coil with a different one and seeing if the problem moves with the coil? Swap the Plug Wires, Swap the carburetor? If a componant is causing the miss then the problem should move when you move that component.
Yes for the coils and no for the carb.


Old 08-21-2020, 01:04 AM
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Stabbing in the dark will just get you deeper in poo, you say (I think) that it runs OK when you spray fuel in the intake? if that's 100% correct, why root around with the ignition system?
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Old 08-21-2020, 06:05 AM
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Originally Posted by noelm View Post
Stabbing in the dark will just get you deeper in poo, you say (I think) that it runs OK when you spray fuel in the intake? if that's 100% correct, why root around with the ignition system?
Good question and good point.
Old 08-21-2020, 06:15 AM
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So I have 2 manuals and in each, I cannot locate anything stating which cylinder is the "1" cylinder. Typically in just about any automotive service manual, somewhere at the start of the manual, there is an illustration of 1 - X cylinders.

The timing analyzer tool arrives Monday, in the end, it just might be that the timing needs adjustment.

Here is the gap spark test for the offending cylinder

Post 5th carb cleaning and air mixture set to 5 3/4

Think without the DVA and timing analyzer tool I am just firing shots in the dark.
Old 08-21-2020, 06:26 AM
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So I have 2 manuals and in each, I cannot locate anything stating which cylinder is the "1" cylinder. Typically in just about any automotive service manual, somewhere at the start of the manual, there is an illustration of 1 - X cylinders.
-------------------------------------------------------------------------------------------------------------------------------------------------------







#1 cylinder is always the highest one on the engine, then next down is #2 (opposite bank on a V-block engine), etc. Upper starboard sparkplug is #1 on your motor.

1-3-5 on the starboard bank and 2 - 4 - 6 on the port bank - top to bottom
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Old 08-21-2020, 10:13 AM
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Originally Posted by eman6501 View Post
You can buy and download this Factory Service manual practically immediately and Im sure all those answers are there. If I knew them myself Id share but Im afraid I dont. Check this link;

https://www.emanualonline.com/Marine...0aAgO_EALw_wcB
FYI.. When trying to purchase from this source, my CC became frozen as the transaction was flagged as fraudulent.
Old 08-21-2020, 10:19 AM
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I bought one from them once and didn't have any issue ? If you can find it, it's kinda handy because you can store it on your phone/laptop/pad whatever and it can be with you at the motor.
Old 08-21-2020, 10:36 AM
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Originally Posted by eman6501 View Post
I bought one from them once and didn't have any issue? If you can find it, it's kinda handy because you can store it on your phone/laptop/pad whatever and it can be with you at the motor.
I agree, very handy to have a digital copy.

I tried a different payment method and the payment did go through. So perhaps it was with my bank. Thank you for the link!

Last edited by TopherMichael; 08-21-2020 at 11:17 AM.
Old 08-21-2020, 04:00 PM
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That’s a really strong spark. I don’t think that’s your problem.
You maybe chasing a goose that is wild on the ignition side for that cylinder.
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Old 08-21-2020, 04:05 PM
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Is this what you are getting to check the timing?

https://boatplicity.com/9028712-cdi-...iABEgKV8PD_BwE
Old 08-21-2020, 07:04 PM
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No, maybe I got the wrong tool?

This one



Old 08-22-2020, 01:27 PM
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Tried to launch the boat and while it idles really nice, slap it in gear and any load, the motor will stall (thank god for a kicker motor). Turn the key and the motor starts right up. While in the water, I tried to adjust the air mixture needle valve and 11-12 turns out just doesn't seem right.

The JohnnyRude arrived today, however, will have to wait till Monday as the PO is closed.

Really feel defeated.
Old 08-22-2020, 02:46 PM
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11.5 turns is WAY too out!

Did you do any CRANKING tests with the DVA of your stator?
Have you inspected the magnets under the flywheel?


Old 08-22-2020, 03:00 PM
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Don't get all tunnel visioned with the adjustment screws, once again, you are just tinkering with bits and pieces, go through the ignition methodically again with your new tools, check the flywheel as mentioned and move on to the fuel system, unless you can eliminate one, once and for all, so far, you're fiddling with screws and pulling plug leads off.
Old 08-22-2020, 03:01 PM
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DVA should arrive Monday, I hope.

I have not inspected the magnets under the flywheel yet. From my last video, it appears that I have a really good spark for the bottom starboard cylinder. Would that eliminate a flywheel issue? If not why?

The bottom starboard cylinder will change RPM's when covering the intake for that cylinder. Responds if I shoot gas in the intake, just does not change idle when disconnecting the plug wire.

Old 08-22-2020, 03:05 PM
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Question...

From this website... https://www.maxrules.com/fixomcoisignition.html

Why do you need to connect a spark gap tester to each plug? Just wondering why they have you connect the spark gap tester."With these new digital power packs, you disconnect the port temperature switch/sensor leads and use a jumper wire to short the tan temperature sensor wire to engine ground. Once you have verified the timing pointer using a piston stop tool (or a dial indicator), connect all spark plug wires to a spark gap tester, and connect a remote starter to the engine and a timing light to the No.1 spark plug wire."
Old 08-22-2020, 03:44 PM
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Originally Posted by TopherMichael View Post
From my last video, it appears that I have a really good spark for the bottom starboard cylinder. Would that eliminate a flywheel issue? If not why?
At idle the rotation of the flywheel with good or bad magnets could be fine enough for the stator produce enough juice for the capacitors to charge up and send a good enough spark to the plugs, but under load NOT.
A bad stator will give you the symptom you describes as well as having broken magnets or if the magnets have come loose and slid towards each other. The gap in the magnets is what produces that Alternating Current (each end of the magnet has a pole...so it goes ++++----- gap+++++----- gap ++++++----- gap)


The bottom starboard cylinder will change RPM's when covering the intake for that cylinder. Responds if I shoot gas in the intake, just does not change idle when disconnecting the plug wire.
The "primary leads" are the teenytiny orange wires that come from the power pack...look for Stevens Primary Lead extenders...they allow you to read the voltage coming into the coils using a multimeter with DVA...they have to be a certain voltage ...the coil is a step up transformer in the order of 40VK+ so you can't read that with a multimeter

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Old 08-22-2020, 05:08 PM
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Originally Posted by cfauvel View Post
Stevens Primary Lead extenders...
i have searched high and low. Can you shoot me a link? Are these the 5 jumper wire pack or the 4 bullet looking things?

I had already ordered a new stator and now have a new flywheel on order. With the shipping delays and so close to the end of the season, I would rather return parts or just keep them.
Old 08-22-2020, 05:34 PM
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Originally Posted by TopherMichael View Post
i have searched high and low. Can you shoot me a link? Are these the 5 jumper wire pack or the 4 bullet looking things?

I had already ordered a new stator and now have a new flywheel on order. With the shipping delays and so close to the end of the season, I would rather return parts or just keep them.
can you cancel your stator and flywheel order...no need to throw money at it if THAT isn't the problem?

it is the 4 little bullet things ...all they are are springs on one side and a solid piece of brass on the other.

Last edited by cfauvel; 08-22-2020 at 08:12 PM.

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