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    Hesitates Under Load? Help!!!!

    1991 Johnson 150, I have verified the compression, put a new fuel system in, changed the plugs and wires, rebuilt all three carbs and i still have not fixed the problem. The engine runs great at idle speed, but when a load is put on it (per a timming light) all six plugs miss.... This problem...
  2. M

    Johnson 150 will idle but shakes when over 2000 rpm

    I have twin 1990 johnson 150's, the problem only occurs with one engine ocationally. The engine will start up and idle fine, and can troll all day with no issues, however when i start to go the engine shakes as if it is only firing on 4 of the 6? I have changed the plugs and drained the bowls...
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