Mercury outboard repair help

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I have not tried sea foam. The motor was brought to a shop once before and the CDI boxes were changed but that still doesn't seem to be fixing it. That's why I still have a feeling it something deeper than fuel and the reason its not going back to that shop. I was hoping there was a knowledgeable Mercury repair shop who can diagnose this properly.

Disassemble carburetor.

Place in giant tube of Pine Sol. Wait a couple of days.

Rinse with hot water. Reassemble. Carb will be like new.

Until you can afford the stage 3 upgrade that converts it to a Yamaha

Sounds like a carb problem or it's timing advancing is way off. Don't keep trying to run it in that condition. You can and will burn a piston. There is a guy I use in breaux bridge, right off I10. Freddy Breaux. He is outstanding and way cheaper then shops. He does all his work at his house. He has all the contracts for all the oil companys that run boats in the basin.

It's hard to find someone that can work on older outboards. All these shops do now is plug in to see code problems and then start throwing parts at the motor till they find the right part.

The stator, trigger, switch boxes, ignition coils, and spark plugs are the only parts to an old school ignition system. There are several threads on thehulltruth.com and YouTube videos that walk you through the diagnostics of these systems. If you have a decent multimeter and are somewhat mechanically inclined, then this should be something you can handle yourself.

If not, Slidell Marine is who we would recommend in your area for Mercury service.

Have you tried changing your fuel bulb, does it act like its losing prime?

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The stator, trigger, switch boxes, ignition coils, and spark plugs are the only parts to an old school ignition system. There are several threads on thehulltruth.com and YouTube videos that walk you through the diagnostics of these systems. If you have a decent multimeter and are somewhat mechanically inclined, then this should be something you can handle yourself.

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My dad is helping me with this and has been a automotive mechanic for most of his life so we are investigating things like the stator, coils, and boxes. We changed the plugs and CDI boxes already so trying to rule that out, but he thinks its still electrical.

I think its also worth noting that the inside of fuel line before and after the fuel filter by the motor was severely corroded, so we changed that but I'm wondering if the fuel line from the tank to the nipple at the back of the boat coming out the hull is also bad.

I spoke with a friend who is very savvy with outboards and he tells me that most of the outboard mechanics he knows make most of their money off changing collapsed/corroded fuel lines from someone running ethanol based fuel (we never have but someone before us could have) and vent tubes being clogged with mud divers or other bee nest.

So i'm going to run the boat again on an external tank and check the easiest issues first. The motor just iddles too well and runs great at lower RPM's which is the confusing thing.

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Have you tried changing your fuel bulb, does it act like its losing prime?

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Bulb has been changed. When we ran it wide open and it would begin sputtering, i felt the bulb and started pumping it to see if it wasn't getting enough fuel. When I pumped, it would come back then sputter again. A friend thinks this is prime evidence of a possible corroded or collapsing fuel line from the tank which is under the floor that I haven't been able to check yet.