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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

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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..

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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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I have a 1978 merc 85 hp outboard with a bad pump i purchased a used one that works mine has 4 hoses


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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.

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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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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...


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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

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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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