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  1. E

    Priming System Operation

    I am trying to troubleshoot a flooding issue and am wondering how the electric priming system works. I have a 1988 20HP (J20ECCA) I have confirmed that the primer is not leaking fuel when not engaged. I pumped the fuel line bulb with the engine not running, nothing comes out of the primer...
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    Lower crankcase seal installation

    I have a 1988 20HP (J20ECCA). I want to replace the seal in the lower crankcase head (398050). The old seal (319664) had a metal jacket and was installed flush with the flange. The new replacement seal (398051) does not have the metal jacket, and came with a note that you cannot use use the old...
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    Cylinder honing

    I am doing a ring replacement on a 1988 20HP (J20ECCA). Can anyone recommend the material and grit for a ball home to put new cross hatches into the cylinders?
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    Primer feeding idle?

    I posted this same issue about 4 years ago. Still battling it and hoping for some new ideas. I have a 1988 electric start/ electric primer Johnson 20HP. The slow idle mixture screw has no effect on achieving a smooth idle. At idle, there was a constant flow of gas bubbles through the primer...
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    1985 30HP Carburetor Identification

    I just received a carburetor that is supposed to be for a 1985 30HP. What I received is tagged 393976. Every part diagram that I view says that the 1985 30HP carburetor is 393977 (very close). I assume this is a 30HP as the throat is the correct diameter, but I can not cross reference the...
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    1988 Johnson 20 HP battery charging rating

    What is the power output of the battery charging system on a 1988 Johnson 20HP (J20ECCA)? I am wondering how many amps can be pulled by accessory power with the engine running, and without compromising the charge on the battery.
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    1988 Johnson Remote Control (0397184) with 1988 Johnson J20ECCA Question

    I have a 1988 Johnson J20ECCA with remote control (0397184). On the remote, under a rubber cap (item #1), there is a three pin connector (Item #50). Can someone tell me the use of this connector? Thanks, Emil
  8. E

    1988 Johnson 20HP idle head scratcher

    I have a 1988 Johnson 20HP (J20ECCA), which has the electric primer. Rebuilt the carb over the winter. This spring it is idling well. However, I noticed that turning the low idle adjust screw has no effect on the idle. I read some threads on models in this year range and realize that I...
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