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  1. K

    Testing Johnson Ignition Coils

    Do you have to use a particular type of ohmmeter to test the primary and secondary windings of an ignition coil? There was a video on utube showing how to test coils and they specifically stated that a common multimeter would not work.
  2. K

    1978 70 HP Johnson Low RPM Limit

    I have a 1978 70 HP johnson that will not go above 1100 rpm. It starts easily and runs fine but when the throttle is advanced above 1100 rpm it dies as if the ignition was turned off. I replaced all fuel lines and tested the fuel pump pressure and it was good. A mechanic replaced the timer...
  3. K

    ignition testing with needle point spark tester

    I have questions about checking the ignition with a needle point spark tester on 70 HP 1978 Johnson engines. First, can this be done on a running engine or is it always done on a crankimg engine? Second, does the sharpness of the electrodes effect the distance the spark will travel? My shop...
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    Spark Plug Color on Seized Outboard

    My 1978 70HP Johnson has been running fine until Saturday. The engine knocked a couple of times and then froze up. After taking out the spark plugs I still could not turn the flywheel more than a couple of degrees. Looking at the plugs two are black and oily and one is a dusty brown. Does this...
  5. K

    1978 70 HP Johnson Running Problem

    I have a 1978 70 HP Johnson that will not run above 1200 rpm. When I increase the throttle further the engine dies. Compression is good, fuel pressure is good, high speed jets cleaned, power pack changed. Checked with timing light and timing OK but #2 cylinder not firing. Swapped coils to see...
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