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merc850 replied to the thread Spark Plug Half-Fouling.

Looks like a weak spark caused by failing stator or trigger. See if the spark will jump a 7/16" gap. Do not use regular reach plugs...

Apr 12, 2024
merc850 replied to the thread No spark on Merc 85hp.

Are you following these steps? https://forums.iboats.com/threads/starting-a-2-cycle-merc-verified.670882/

Apr 10, 2024
merc850 replied to the thread 1968 20hp lower unit seals.

A manual would help but in lieu of one I'm posting some starter pages: (before you start soak the cover nut area with a penetrating oil...
Apr 2, 2024
merc850 replied to the thread No spark on Merc 85hp.

One marine starting battery not a deep cycle one.

Mar 29, 2024
merc850 posted the thread Waiting to launch in Mercury & Mariner Outboards.

Almost launch time (except in canada) and many guys will be changing their impellers re-installing their lower units and having shift...
Mar 28, 2024
merc850 replied to the thread No spark on Merc 85hp.

If you put a voltmeter on the + starter terminal and the cowl ground read the voltage while turning over the motor, it should be 10-12...
Mar 28, 2024
merc850 replied to the thread Merc outboard serial number question.

Good that you've worked on one before so you know the plug wires screw into the cap, CDI has the engine harness...

Mar 24, 2024
merc850 replied to the thread 1965 3.9hp plug fouls.

I don't know what brand of oil you're using but I've found that Amsoil synthetic smokes less and if you live in the US you can get 100:1...

Mar 24, 2024
merc850 replied to the thread Merc outboard serial number question.

i think you should rewire it - there seems to be some incorrect connections and corroded wires which can cause a major fire. I am...
Mar 24, 2024
merc850 replied to the thread 1965 3.9hp plug fouls.

The Nr. refers to heat range - The middle number indicates the heat range of the spark plug, the higher the number the hotter the heat...

Mar 23, 2024
merc850 replied to the thread 1965 3.9hp plug fouls.

According to the Merc manual the 1964-66 3.9's used a J7C plug and the gap is .025"/ the points should be set at .020". Your motor falls...

Mar 23, 2024
merc850 replied to the thread 1965 3.9hp plug fouls.

That's not the right plug for that motor - J8C https://www.oldmercs.com/category_s/1208.htm

Mar 22, 2024
merc850 replied to the thread Mercury 85HP Thunderbolt Ignition Series??? Whats missing??.

Found this wiring dia. appears that those motors used ADI not a distributor.
Mar 21, 2024
merc850 replied to the thread Mercury 85HP Thunderbolt Ignition Series??? Whats missing??.

I'm guessing that the fuel pump/wiring harness/ignition can't be used in your motor, go have a look at it if you can with cowling off...
Mar 21, 2024
merc850 replied to the thread Mercury 85HP Thunderbolt Ignition Series??? Whats missing??.

Correct! serial numbers 3186263 thru 3493912 were 1972 models.

Mar 20, 2024

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