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sluggish motor problems
June 10, 2009
4:12 am
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T_Musky
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April 29, 2007
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My motor sounds sluggish when running in between idol and full speed. It's a 40 hp merc 4 stroke tiller. I don't think it's cheap gas, because it has been doing this for a few months now and have re-filled the tank several times. At low speed or idol speed its fine. And when running it flat out top speed its fine. But at in between speeds it shakes and sputters and sounds like it wants to crap out. Any ideas on what to check for? I don't want to take it to a repair shop if I can avoid it. I personally have not done maintenance on this motor in the past (took it to a shop) and just wanted to see if anyone had the same problem or suggestions before I go digging around in there.

Thanks,
Tim

Team MTF

June 10, 2009
4:22 am
kevljohnson
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Tim

Check your plugs and wires clean them up, maybe it is something simple. Also heard that carbs have been getting build up from the ethanol and giving people problems. You could google search the ethanol problem and see if it sounds like it
Good Luck
KJ

Some days it is not about how good you are, but how bad you want it!

June 10, 2009
9:54 pm
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It sounds like one of your ports in your carb is clogged.I'd replace the plugs an run some stable thru the motor.you may have to take the carb off an let it soak in gum out.
Timj

June 10, 2009
11:32 pm
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stevewarner
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check for possible water laying in bottom of tank or fuel filter.Does sound like a possible plug issue like Mr. Johnson said.

Catch and Release works for everyone,keeping a fish works for just one!

June 10, 2009
11:57 pm
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June 11, 2009
12:16 am
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T_Musky
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Well, I used the red! That's what I winterized the boat with and there was probably some of that left over in the tank. Thanks for the info guys.

Team MTF

June 11, 2009
3:28 am
kevljohnson
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There are a few good threads on muskiefirst about the ethanol problems
http://muskie.outdoorsfirst.co.....38;start=1
KJ

Some days it is not about how good you are, but how bad you want it!

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