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How do you change the park plugs in a 40hp Mercury outboard four stroke motor?

Posted by Greg Macey on

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Steve P

Steve P

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Greg, if you are puzzled about changing spark plugs.. Please take this to a shop somewhere.

Posted on Jun 06, 2017

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I HAVE NO SPARK ON 40HP MERCURY OUTBOARD MOTOR
Hey Barbara,, get one of these manuals,,, you will need it to trouble shoot this outboard..

Mercury Outboard Manuals by Seloc 1965 2014

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1 Answer

I have a mercury outboard with serial # 5636683. Can you give me the shaft size of the motor?
Hey Robert,
What motor do you have?.. Size, year, two stroke/four stroke..etc.. and what shaft are you talking about?
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forums.iboats.com/Mercury-Outboards/Fuel-Pump
5, 2004 Mercury 225 four-stroke EFI no power to Low Pressure fuel pump. Why please help · Mercury & Mariner Outboards. 13, Mercury 850 (85hp) - Gas pumps through the top carb - Failed fuel pump? ... 1, 1969 7.5 H.P. Mercury (Bad fuel Pump)? ... 1971 · 1972 · 1973 · 1974 · 1975 · 1976 · 1977 · 1978 · 1979 · 1980 · 1981 ...

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How to remove the lower unit on a Mercury outboard motor ...




Dec 01, 2015 | Boating

2 Answers

I have no spark on 1989 7.5 evinrude outboard motor
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1 Answer

Free Mercury Outboard ONLY, 2-40HP 1965-1989 Repair Manual 1-2 Cylinder, 2 Stroke
I have a problem with my 2 stroke 20hp mercury 1989,when I run 10-90% throttle it's works fine but when in 100% its only runs in 90% and doesn't sound normal like it's not burning right.

May 11, 2012 | Seloc Mercury Outboard Engine Repair...

1 Answer

Free download for repair manual for an Evinrude 1987 40HP outboard motor
My outboard motor is old and used.When I went to run it for the first time everything worked except when I went to put it in forward gear the boat went slowly but when I gave it more gas the engine just reved up but the boat wasn't going any faster.The motor is 40hp gale model.I think because it is bought used the prop is not the right one and it seems like it's slipping as I go faster.
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Thax, Don

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1 Answer

I have a 40hp four stroke about 6 years old. It has sailed about 100 hours. The motor strarts and is running fine to about 2000 rpm. Between rpm 2000 and 3000 the engine is running badly. I'll be grateful...
Change the oil seal at the top and bottom engine and service or rebuilt your carb. Clean-up all electronic gear under the engine flywheel maybe its wet by the oil mixed.

Nov 15, 2010 | Light Outboard Motor Boat Bass Fishing...

1 Answer

I need to change the incandescence candles of my two stroke outbord motor, 40hp, about 20years old. I don't know the reference, may be NGK B7HS ?.
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1 Answer

Re-assembling lower unit of 40HP Mercury 4 stroke
I found a lower gear case assembly diagram at http://www.crowleymarine.com/mercury_parts/6995/240.cfm which helped me understand how the shift mechanism works. This clued me in to the fact that I was missing the cam follower rod which I then found I had inadvertently mopped up in a shop towel when cleaning up spilled gear oil. After that discovery, assembly and operation was quick and successful.

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40hp 1987 yamaha outboard motor will run for 30-60
Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.

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