Small Merc Bogging

My 4 stroke, 15hp 2000 Mercury purrs like a kitten till about 4/5th or so speed. When I open it all the way, it keeps running, but sputters and feels like it is slipping. I originally thought the prop was slipping, but I took it off, made sure there wasn't any line bogging it down and made sure the holding nuts were tight.

Any thoughts appreciated. Perhaps I need to clean my carb, I do that a couple times a year. It just feels a bit different than it usually does when my carb is getting clogged, but who knows for sure?

Thanks, Paul

If your prop has a rubber hub try this one.. Take white out make a mark on prop and hub that match. Take it back out and run it until it does that. Come in and check to see if marks are still lined up. Only way to tell if one is slipping.

I had an 07 Merc 15 hp 4 stroke and had to have a stator coil replaced.

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That sounds like you're bumping the rev limiter at w.o.t. Is the prop damaged?

thanks for the tips. the prop does not appear damaged in any way other than the normal nicks on the bladesyou get from hitting those conway stumps while idling along.

Check your fuel lines and especially the bulb. All should be soft and pliable with no cracks.

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Originally Posted by Barnacle Bill

Check your fuel lines and especially the bulb. All should be soft and pliable with no cracks.

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Especially this...it's not normal to have to clean your carb a few time a year, I had a 23 year old merc and I never cleaned the carb. I would consider just replacing those fuel lines if you're having to clean those carbs that much.

You running ethanol gas?

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Originally Posted by FurFlyin

You running ethanol gas?

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no, pure gas. i don't "have to clean them", i just do because it is so simple and takes less than 20 minutes. i really don't think the carb is the problem.

Check for air in your fuel connections.It sounds like you are getting enough fuel for lower rpm's but at or near wot there is not enough fuel and you're pulling in air from outside. Btw make sure fuel line size is correct for connectors. Hope you solve this problem.

Status?

I had a 15 hp merc 4 stroke doing the same thing and it was the inner lining of the lines coming apart! New lines and bulb and back to running good!


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I just put my Boat back in service after it was parked 4 years. The first thing I did was remove the fuel line to Purge out the old Fuel. I had put in a additive for storage. the fuel lines Deterioration from the inside had caused the fuel to turn Black and the lines were hard. I cleaned out the Tank, replaced Hoses Fuel Filter and Plastic Zip ties with metal hose clamps. I removed the Carbs and cleaned with Acetone as it will not damage anything. as bad as the junk was in the tank and lines I might have needed new Carbs. Dont trust the stuff sold that is to prevent these kind of problems.... Old O rings on Connectors will cause Air leakage at higher speeds but do not leak a drop of fuel when the Bulb is pumped up .... Dont forget the Connectors

Fuel pump rebuild might be next as it might not be able to keep up under full throttle. A two stroke can burn a hole in a piston if you run it lean over time and a $30 or so rebuild kit every few years is not a bad idea. My 2004 150efi(taho q3 f/s) that I sold I rebuilt the water & fuel pump every two years as the fuel we get here is not the best to say the least and my newest 2013 tracker 175 tf has a new fuel pump on it and water pump was rebuilt before I bought it.(have papers)

You need to get YOU a NEW Carburator you have worn the threads on the jet screws and have bypass oxygen getting into the fuel system!!!!!!!! Buy real gas add 2 ounces of seafoam gas stabiliz per 6 gallons and 4 ounces of starbrite and you will have to find something else to work on!!!!!!

happy New Year!!!!!!!!!!!!!!!!!!!!!!!!!!!