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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?
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.
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."
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....
Cliff
1966 13' Sport with a 1993 40hp Yamaha 2 Smoker
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...
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
Edited by joninnj on 08/26/08 - 7:34 PM
Jon in NJ
Many other boats and outboards in my boating history
The Whaler is the one I like the best!!!
