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  1. D

    Mercury 40 ML 4SEF SN 1C056105

    The motor was cold when i did the test. Thanks for the info !
  2. D

    Mercury 40 ML 4SEF SN 1C056105

    Hi im looking for opinions, a guy is selling me a mercury 40hp 4 stroke outboard, he said the motor its been sitting for about 6 months and now is not runing, spark is not strong enough and compression is: 1- 149 psi 2- 90 psi 3- 90 psi. He is asking for 200 usd, could this compression...
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    Boat performance

    Will get a gap meter, but here is the test i did with new coils and maggplate.
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    Boat performance

    Maybe not haha! , I got the motor a year ago and it was barely runing, so im slowly progessing on i rebuild everything, carb, coils, condensers, maggplate, electric starter, even the electric choke, everything works now, looks like i just have to tune it up
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    Boat performance

    Will have to check the reed valves. High speed is in position and clean, how do i check the number ? Part number? Or what do you mean
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    Boat performance

    Yes to the 8 mm gap. What should i check for with the reed valves ?
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    Boat performance

    Another video, this is the other boat i mentioned but just me and my brother
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    Boat performance

    Sparkplug gap is set to 0.030 inches (0.76 mm) spark is really strong. Fuel pump was changed a month ago. I did everything i should acording to the manual, thats why i think is not the outboard itself. But im not a mechanic so im here for suggestions.
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    Boat performance

    Both were used props. Yes, throttle linkeage is as it should be, butterflies open as they should. At WOT i can hear rpms going up and the bow goes up as well, but still does not plain.
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    Boat performance

    Here is at idle
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    Boat performance

    By sound, coul you guys tell if this sound like is runing with 1 cylinder ? Motor shoul is runing with like half, no more than 3/4 throttle
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    Boat performance

    So the idea here is to not let the coil charge get to the sparkplug right? I am 100% sure that there is spark on both cylinders, a pretty strong one, i also replaced both sparkplugs with the service i did last month.
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    Boat performance

    There is where i found the best performance so far
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    Boat performance

    How do i test for this ??
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    Boat performance

    I just replaced condensers, coils and points a month ago, im pretty sure it is runing on both cylinders
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    Boat performance

    Hello, I would like to have your opinions about my boat's performance. Attached are some pictures of my boat, which is around 12 ft long and around 4ft to 5ft wide, made in fiberglass. In terms of weight, I'll say it's around 200-250 lbs. I have it running with a 1975 25 hp Johnson 16-inch...
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    Flywheel magneto draggs maggplate with it

    I was able to fix this, thanks guys! It turns out that the charge coil was not perfectly aligned to the marks on the magplate, i missed this during the assembly, moved the coil like 2 mm away from the magnets and aligned to the marks on the magplate and it fixed the problem
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    Flywheel magneto draggs maggplate with it

    There is only one coil under the flywheeel and is the charge coil, and it is clear and flush where it is suposed to be. The ignition coils are back near the sparkplugs. There is no marks on the coil that suggest the flywheel is touching it. And from what i can see there is no way to take the...
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    Flywheel magneto draggs maggplate with it

    Hi, I recently replaced the maggplate components (setpoints and condensers) and the coils on my johnson 1975 25 hp (25R75B) and also cleaned all the maggplate and the rings under it. The problem im having now is that the magnets on the flywheel "seems to be to strong" and they drag the...
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