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I have a 2002 Merc that runs a little rough at idle but is very smooth and strong above 2000 rpm. Not even a cough above 2000.

Recently it has started to hesitate at about 1800 rpm when I accelerate either slowly or quickly from 1000 rpm. Once I get beyond 1800 and accelerate there is no hesitation.

I've tried a couple of cans of Sea Foam and am treating the gas with Star Tron but that hasn't seemed to help. I thought the first treatment with Star Tron eliminated the hesitation but it has returned.

I haven't tried the Sea Foam directly into the carbs yet but wondered if the hesitation on acceleration indicated something special?

Jack

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While I know the boat is recently new to you, how much use this season? Old fuel?

While not an expert, I would guess your low speed carb jets are clogged. A shock treatment could save you from needing to disassemble and clean your carbs.

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Phil,

The motor ran like this last year right after I bought it but didn't hesitate when I accelerated; that only started this year but with new fuel. At the end of last year I treated the fuel, ran it throught the engine and drained the tank before storage.

All new fuel this year; on the other hand I didn't get to use it much in June or July because of the rain. But I suspect the problem is left over from last year and needs the shock treatment in any event.

I was just hoping someone would say "oh that's just the ..... it's only a $50.00 part."

I'll try the shock first. Thanks.

Jack

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My Yami did about the same thing. I had to take the bowls off the carbs and spray carb cleaner directly into the ports. The motor runs like a top now....

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Jack,

I would also drain the carbs before you consider anything more invasive. I do not know your engine well, but I suspect there are brass drains toward the bottom of the carbs. Could be water or junk sitting in there...:o

I have had good results with seafoam... But... I would also be careful when mixing additives. Star tron primary removes moisture, seafoam also does that as well as cleans but may not have compatible chemicals.

good luck