50 HP Mercury outboard problem

[Blue Oval]

Ok, boat question. The 2004 Mercury 2 stroke on the RIB started acting up. It will start up cold, run to Advance and around perfectly. 2 times I anchored then headed back to town, almost to town and it starts to bog down. 1/2 to full throttle just makes a waaa noise like you stuffed a couple rags in 2 of the three carbs. Idle to the ramp and pull out. Yesterday I replaced water separator, fuel filter, all gas lines and primer. I put fresh gas in it and sea foam. Filled the new fuel filter with sea foam to blast the carb. Drove around for over a hour, ran great. Anchored at Whittings, started its new bog thing just as I got to no wake zone. At this point I’m thinking electrical? When it starts to bog I squeezed the primer and no change, if I hit the choke it will kill the engine

 

[fishing fool]

Fuel air mixture screw.
Might need to adjust for change in air temp.

 

[Orange Juice]

Ok, boat question. The 2004 Mercury 2 stroke on the RIB started acting up. It will start up cold, run to Advance and around perfectly. 2 times I anchored then headed back to town, almost to town and it starts to bog down. 1/2 to full throttle just makes a waaa noise like you stuffed a couple rags in 2 of the three carbs. Idle to the ramp and pull out. Yesterday I replaced water separator, fuel filter, all gas lines and primer. I put fresh gas in it and sea foam. Filled the new fuel filter with sea foam to blast the carb. Drove around for over a hour, ran great. Anchored at Whittings, started its new bog thing just as I got to no wake zone. At this point I’m thinking electrical? When it starts to bog I squeezed the primer and no change, if I hit the choke it will kill the engine

How old is the fuel pump?

 

[Riverbottom]

How old is the fuel pump?

That is a good call. Ethanol in the fuel kills them. Had to change the one in my Merc. every couple years.

 

[Orange Juice]

The other thing I’d check is the size of the gasline running to the tank, if you replaced it.

I believe they sell two sizes, and both will fit.

 

[Blue Oval]

I just spent 2 hours tearing it down to the carbs. I found dog hair in one carb and more hair in intake. The Golden and Pom are always with us. Dog hair in a jet? Going to sea trial it.

 

[Blue Oval]

2 hours on the lake with out a problem. Still not sure, but that was a good sign.

 

[Blue Oval]

We agree there should be a plug on the hole. Does anyone have a 2004 ish Mercury 2 stroke. Just curious,

 

[Orange Juice]

Not sure which covers these are.

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[lbhsbz]

2 hours on the lake with out a problem. Still not sure, but that was a good sign.

Dog hair doesn't have the octane required for a Mercury Outboard....as you've discovered. lol

 

[Blue Oval]

Found one at ace hardware.

 

[Blue Oval]

Never updated this. I got it to cut out and was able to check spark. Number two spark plug wasn’t getting spark, it would come and go. Replaced #2 coil and removed the flywheel and put in a new trigger. Ran great for the rest of the summer. Cleaned it all up this weekend and put it down for a winter nap.