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Mercury outbord motor

Will drop 600rpm but not miss

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You may have this posted in the wrong product category. Please select another category appropriate to the problem and re-post the problem so the correct expert will see and respond to the question..
This is for car and truck problems related to factory installed systems not add on aftermarket systems.
This post can't be removed or moved, please re-post the question in the correct product category. Thanks

Posted on Oct 25, 2012


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Posted on Jan 02, 2017


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Feb 05, 2017 | Mercury Cars & Trucks

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My 140 hp mercury outbord will only run if u take 1 spark plug out it does not mater witch plug it is

very unusual problem
need more information before I attempt to answer
is it a 4 stroke or 2 stroke , 4 cylinder in line or v engine
carby or efi --year and model would be a help as well
does it run ok at idle but fail at rpms when you take a plug out it runs well on the remaining cylinders
I have a germ of an idea but I need that information first to see it it is viable
comment , don't post as posts are not linked

Oct 02, 2016 | Mercury Cars & Trucks

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How do I set the timing on my 1967 Mercury outboard motor? It starts but seems to sound like it has a slight miss, and when you idle down to put it in gear, it dies.

I have seen it done. The shell is removed to the points. A probe is inserted in the cylinder hole for #1. When the piston is clocked to TDC the breaker plate is locked when the piston touchs the probe and provides continuity. Some engines may require a few timing degrees either BTC or ATC. Throw in new points to eliminate the low end miss as weak spark at low rpm may not flow good on worn points.

Relist on outboard motor or boat section of Fixya.

Aug 30, 2015 | Mercury Cars & Trucks

1 Answer

Mercury outbord motor missing

First, you will get more response in the boat or outboard section of Fixya. You are listed under Cars and Trucks.

It will also help if you state the Year and size of the motor. If I remember correctly, some of the motors had screen filters for the fuel and some had individual feed lines to each cylinder.

Check your fuel lines so you know that you are not drawing air instead of fuel. Also if this is a 4 cycle motor, they had a low oil cutouts and they can work so fast that you would not detect a miss, just a drop of RPM.

Sparkplugs are reasonable, throw in a new set , keep the old ones for emergencies and see if that helps.

Relist in proper section if my solution does not work. Please rate.

Oct 25, 2012 | Cars & Trucks

1 Answer

Loss of power when up to temperature

Sounds like a spark plug wire issue, spray the wires with a fine mist of water and see if it misses.

Nov 03, 2008 | 1991 Mercury Grand Marquis

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