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Outboard Motor issues...

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Hoping to get some wisdom on a motor issue...

Was running down Bayou Dularge 90% throttle and my outboard motor killed. It is a late 1990's 115hp Johnson. Well put it in neutral and tried to refire and get underway. Motor was real sluggish (like a dead battery.) I toggled to my other battery which was a little worn after 3 days out and both batteries were sluggish. I finally got it fired but the motor ran really ruff and would kill at idle. I opened it up to get to the launch as long as I stayed away from high throttle it ran but hi-throttle would kill it again. I didn't have time to mess with it Sunday evening, but I plan to check a few things out. Charge batteries, spark plug, check fuel, fuel line. I have been reading a little and hear maybe a rectifier or stator?

Any other thoughts or ideas.

Thanks.
Chris
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Re: Outboard Motor issues...
could be multiple things, but sounds like a rectifier. My good friend experienced the same thing on an older Johnson. Ran like a top, then sounded like it was bogging down. Ran fine at idle, but same thing. If you didn't have any tell tell signs, then my suspicion would be the rectifier not throwing or throwing limited spark to all cylinders, almost like it would be deregulating on say a Yamaha OX66
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Re: Outboard Motor issues...
Don't think rectifier affects how motor runs as rectifiers convert AC power from alternator to DC pulsing to charge battery. Suggest you check rectifier, there are videos on U Tube on checking rectifiers. Also tach may not work properly as one leg on rectifier powers tach. Possible with dead battery stator not putting out enough power at full throttle (when fuel mixture is densest.) Charge battery fully and try motor again. If motor does same thing try pumping primer ball to see if it eliminates problem, (if it does then fuel pump probably bad.) Be sure tank vent is open/clear and fuel filter is clean.
On old Evenrudes: When stator went out it was out and had to be replaced.
Had power packs drop a cylinder and motor would run just not full power.
When rectifier went out I was trawling at night, When I got back to launch I shut off motor and when I tried to start it to drive boat on trailer battery was dead.
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Re: Outboard Motor issues...
Plugs and battery are good. Runs ruff still at idle. Carb clean?
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Re: Outboard Motor issues...
I had a 50 johnson 98-2000 model with from what I remember same issues...The magnets under the flywheel came loose...They were epoxied on...Had it in the shop about 2 weeks before the guy running the place remembered about them coming unglued on some v4's...Told me I either needed new flywheel or he would try some kind of epoxy and not charge me nothing for trying it out....It worked ....
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Re: Outboard Motor issues...
Check that each cylinder has fire. I had issues with a 1996 88spl turned out to be bad connection where power pack wires connected to the coils. While cleaning one connection I noticed the insulation cracked and wire inside looked green (corroded.) Being it was the original power pack I replaced it.
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Re: Outboard Motor issues...
Thanks for the help guys. I ended up bringing it in to the shop. Hopefully with a painless result. I am still hoping to hit the next hunting split. My son shot his first duck and is pretty hooked...

Thanks and be safe on the water.
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