Need help with 1990 US Marine Power Force 50 HP voltage regulator

[Hines]

Hopefully I posted this in the proper forum!

I'm trying to locate a voltage regulator on Amazon for a 1990 US Marine Power Force 50 HP outboard. Seeing that the company is no longer named that, i'm not certain which one to buy. Any help is greatly appreciated. I do have someone that said they would swap it out for me if I would order it....but they didn't want to do the leg work to find the part. Understandable.

For some backstory, last year the engine was running fine then one night it cut off. I took it to a shop and they replaced some resistors. It ran fine the rest of the season. This year I took it out the first time and when I got into the throttle it started chocking down a little and losing power. I looked at the voltage and it was reading 16.8. It shut off, but it cranked back up. When I got into the throttle again it started to lose power and i dropped the throttle down and it maintained proper power (and was reading almost 15v.

If you guys think i'm barking up the wrong tree, please let me know! Thanks for your help!

 

[pnwboat]

The battery voltage is not used to run the motor. The only purpose of the battery is to engage the starter, and operate lights and accessories. From what I can tell on the parts manual, it looks like you probably have a voltage rectifier. If that is so, then 16 volts is not abnormal at full throttle.

The ignition system runs off of voltage generated by the stator which is located under the flywheel.

Getting back to your problem, if it runs fine at partial throttle but not at full throttle, I would suspect maybe a fuel delivery issue. If you have a primer bulb, try squeezing it repeatedly while at full throttle. If that temporarily fixes it, then maybe the fuel pump diaphragm is bad.

 

[Hines]

thank you for the info. Sounds like i just need to take it to a shop. Beyond my technical know how.

I did check the water level in the batteries (i have a switch for 2), the water was low in both. That would have no impact on any of this would it?

 

[jerryjerry05]

Double battery's not your problem.
If they are strong enough to start, then they shouldn't be a problem.

Sounds like maybe there is water in the fuel?
Possible the inline connector might be bad?
Maybe even the squeezie is bad?
Does the ball pump up firm?

Location?

 

[Hines]

Yeah the ball pumps up firm and stays firm. Last night I cranked it up again and revved it up high to see if i could get voltage readouts that high again, I could not. I wasn't super comfortable letting it rev high in the trash can that I had it in.

I popped the top off of the engine and there was a little gas dripping from the carb, maybe it was flooding itself out. Seems unlikely since I was able to crank it right back up after it died the first time.

I trust the gas. It's a brand new gas tank and the gas station that i use is very reliable for the boating community around here (non ethanol as well).

I'm located in western part of NC.

 

[kbh121956]

Hines, I have the same outboard. I really like the 50hp. Your primer bulb stays firm is good. This means that your fuel pump diaphragm isn't torn. Do you mix your fuel 50:1? I use the best 2 cycle oil that I can afford. Wipe up the fuel that was dripping from the carb, Start it up again and let it idle. Any fuel dripping from it? If you are not in gear, you can't rev it up super high. If you put it into gear, it'll empty that can in a heartbeat. You could remove the carb bowl and check for junk in it. If I remember correctly, it's a size 7/16's or 3/8ths. Hard to get to but it can be done. Chances are if the bowl is gunked up, you need to clean the carb. Mine was gunked up with semi-hard old 2 cycle oil, I removed the carb and cleaned it with carb cleaner spray. If your careful you shouldn't even need a carb kit. Good luck and keep us posted.

 

[Hines]

I've been mixing 40:1. I took the boat to a buddies place today, he is going to look it over ( he grew up working at a marina) if the weather holds out, I'll go over tomorrow and will remove the carb. I will definitely update.

thanks all

 

[jerryjerry05]

Too much oil 40/1 is almost as bad as not enough oil.
The more oil the tendency is that carbon builds up and collects on the rings.
Do a de-carb and mix 50-1

The fuel drip: some is normal.
Too much can be the reeds are bad??

The 50 ran in a barrel can run away with it's self.
Just don't over rev unless your in the water.