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    Strobotest on a Merc 50hp

    Taken the engine uot of the water, into the workshop. Put a stroboscope to the plugs. And had the engine running. 1:st cyl yellow, at tickover, and fading at revs. 2:nd same as nr 1. Nr 3 and four, almost whiteblue in the light and getting stronger at higher revs. Changed the red and blue from...
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    DVA-multimeter The result. Mercury 1976/50hp

    Hi Chris and everybody. I finally made my DVA meter. According to this diagram http://forums.iboats.com/showthread.php?t=374544 Measured my cables, and obtained the following values. The problem during the last two years, is that the engine been sick. Very sick. No revs, no speed...
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    Change the red/red-white, blue etc etc

    When changing the cables from the stator at the box. to see if the trouble with week spark on the eg number 1 and 2 coil. Can one change only the red with the red/white? Or only the blue with the blue/white? The spark get so week that over 2000 rpm, it runs on two cyl of four. After I changed...
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    DVA-Adapter

    Hi I want to do a dva from this drawing http://forums.iboats.com/showthread.php?t=374544 and tried to order parts but the electronics firm had more questions than I could answer. There was more to choose from. He wanted more detail eg "greencap" 0,47uF there was more then four. He had a resistor...
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    Only 2 of 4 coils gives a good spark.

    Hello This will be the .third bad year with a faulty engine. I feel like slowly sinking it in the deepest part of ..... Finaly I found that I lose the spark when the rpm get higher. It will jump easy more than ?" (10-15 mm) at tick-over (idling) When increesing the revs to approx 2000, number...
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    Gaskets?

    Mercury 500 50hp/-76 2-stroke 4 cyl. Hello As seen on the pics, there is two holes on the carb. And they are just two holes. But one on the block. The green dot shows were the hole in the carb goes. So the grooves in the gasket seems meaningless. The gasket on pic 3, shows the one with one...
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