• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.


Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

79 johnson 55 hp no spark

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • 79 johnson 55 hp no spark

    i am new to thi forum and just recently bought a john boat with a 1979 johnson 55 hp. the problem is i do not have any spark i pulled the fly wheel off and emery clothed the magnets but still nothing. i used a multimeter to check if there was any power coming from the coil wires but nothing. could these magnets go bad over time or the coils?


  • #2
    Re: 79 johnson 55 hp no spark

    If your coils have any goo leaking around them or are cracked you won't get spark. It is odd that they would all go at once. The magnets are probably not your problem. Have you had this engine running in the past or is it new to you?
    If I wanted your advice my wife would have told me to ask you for it.

    Comment



    • #3
      Re: 79 johnson 55 hp no spark

      no goo running out of the coils i had it runing about 2 years ago. i tested the voltage coming out of the flywheel wires and do not get anything. this is the first boat motor i have worked on.

      Comment



      • #4
        Re: 79 johnson 55 hp no spark

        If you have zero spark to start, locate the black wire with yellow stripe, disconnect it and re test your spark. If spark returned, your kill circuit has a fault.

        Are you getting a good 250RPM when cranking? Any less and spark wont be there.

        Testing the power pack and coils is a little harder, especially without a known good one. Do you have a DVA meter or adapter?
        Chris

        Top Secret Files:

        http://forums.iboats.com/showthread.php?t=299680

        Comment



        • #5
          Re: 79 johnson 55 hp no spark

          i am going to go try to find the black wire with yellow stripe. it has good cranking rpms. i dont have a dva meter but have fluke mutimeter

          Comment



          • #6
            Re: 79 johnson 55 hp no spark

            ok taking the black wire with yellow stripe off made the spark work on the bottom cylinder. thank you very much. the top cylinder still has no spark could this be a coil? i swapped the spark plugs and both work on bottom cylinder.

            Comment



            • #7
              Re: 79 johnson 55 hp no spark

              Ok you likely have a combination of 2 problems. First is easy to diagnose.

              Your coil on the top cylinder is likely shot. Swap the coil, with the bottom cylinder. If spark now appears, you need a new coil.

              Your main problem is that your kill circuit has a fault. Likely locations are the key switch, harness or shift switch. You may need to run a new kill wire temporarily and see if that cures it.
              Chris

              Top Secret Files:

              http://forums.iboats.com/showthread.php?t=299680

              Comment



              • #8
                Re: 79 johnson 55 hp no spark

                i switched the coils and both work now. loose wiring maybe on the bottom one maybe. i switched them back and the spark works now. i got the motor to run by pull starting it the starter wot turn the motor over fast enough to make spark. i am going to try cleaning up the terminals. thanks for the hep. where is the cheapest place to get a service manual?

                Comment



                • #9
                  Re: 79 johnson 55 hp no spark

                  Ebay. Get a used factory service manual. Do not get a clymer or seloc. They are junk. Glad you fixed it yourself, now hit the water.

                  Take all the wiring connections off pertaining to the starting circuit, and file them to a shine, then re tighten. This includes at the battery, starter, solenoid, and engine ground. Also check for nicks, cuts, and abrasions in the wiring. "Crunching" when you flex it is a sure sign of corrosion. VOltage drop testing is a good way to troubleshoot this.
                  Chris

                  Top Secret Files:

                  http://forums.iboats.com/showthread.php?t=299680

                  Comment

                  Working...
                  X