87 50HP VRO Evinrude - Could this be my problem?

saltchuckmatt

Commander
Joined
Jul 19, 2019
Messages
2,992
you may want to check your e-mails to me to find the name ! jaques wasclose
I only repeated the 3x9 suggestion thinking you may have forgotten it :)

Jacques...;-)
Yeah, I winged it....my French needs much improvement!

And I did forget about the big 3 until you mentioned it, but I don't use mine. I've retired that to wall art!
 

FishAtFive

Seaman Apprentice
Joined
Sep 3, 2025
Messages
37
I went into this weekend with two objectives: verify the stator is bad with a different meter and verify the primer solenoid is functioning as intended. After thinking it over, I chose a different route.

I knew the stator would cost about 110 to rebuild, and a battery is about the same. Also, my time is very limited until about Thanksgiving, so I took a gamble. I installed a LiFePo4 cranking battery, completely removed the rectifier, disconnected the stator, and the Pr/R and Gy wires that connect it to the battery loop. I also consulted an EE to make sure a disconnected stator would not cause a fire.

I set up my poor man's test tank and gave it a try. Started right up and idled it for a while, forward, reverse, all good. Shut off the motor and turned on my fish finder and waited about a half hour to simulate me fishing a spot. Did that on and off most of the day, and every time it starts just fine. A few times, I intentionally did not push in the key to beat on the battery a little bit.

After about 5 hours of doing that, the new battery only went down 5%. At that rate, I could fish a couple of days and not even charge it, not that I would. It's my opinion that the fautly stator slowly degraded the lead acid battery by leaving it uncharged for too long before I could get home and charge it. The degraded battery did not have the power to spin the flywheel fast enough to get good fuel pressure. Something that an unexperienced eye would not catch.

Thanks for all the help, I could not have gotten this fixed without it!
 

Crosbyman

Vice Admiral
Joined
Nov 5, 2006
Messages
5,885
just make certain your engine's charging system can handle a LiFePo4 battery because ...for instance they are not recommended on more modern ETECs. They have a BMS ( bbattery management system) and don't react like a conventional lead acid or AGM battery so don't mess up your charging cct. to savea few pounds.

hopefully an older Evinrude is not to fussy like an EMM on a ETEC !!
 

FishAtFive

Seaman Apprentice
Joined
Sep 3, 2025
Messages
37
just make certain your engine's charging system can handle a LiFePo4 battery because ...for instance they are not recommended on more modern ETECs. They have a BMS ( bbattery management system) and don't react like a conventional lead acid or AGM battery so don't mess up your charging cct. to savea few pounds.

hopefully an older Evinrude is not to fussy like an EMM on a ETEC !!
Yep that's why I disabled the charging system. Removed the rectifier and disconnected the stator and disconnected the charging loop. These new batteries have a flat discharge curve, the voltage stays mostly constant until it has nothing left and then it drops off a cliff. This one I got even has a gauge right on the battery with a % left and voltage. It's was a little over $200.
 

Crosbyman

Vice Admiral
Joined
Nov 5, 2006
Messages
5,885
missed that... need new blasses ...:)

"completely removed the rectifier, disconnected the stator, and the Pr/R and Gy wires that connect it to the battery loop. I also consulted an EE to make sure a disconnected stator would not cause a fire."
 
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