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1968 Evinrude 85hp electric shift no spark

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  • 1968 Evinrude 85hp electric shift no spark

    I just picked up this old evinrude yesterday and I cant get spark at all. I have the flywheel off and noticed that there is no antireverse spring. Would this cause a no spark issue if its missing? What other things can I look for? I am completely stumped.

  • #2
    A missing anti-reversing spring is NOT the cause of the no spark condition.

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    • #3
      That's what I figured, thanks. What is the amplifiers function? Is it a cdi? When key is on it makes clicking noises.

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      • #4
        The amplifier takes 12 Volts from the battery and increases ("amplifies") it to about 300 Volts, and stores it in a capacitor until time to fire a cylinder. At the same time, it is looking for a signal to tell it that it is time to fire. When the points break, that is the signal it is waiting for. When that happens an electronic switch sends that 300V stored in the capacitor to the spark coil, and the spark coil builds the 300V up to whatever it takes to fire a spark plug (thousands of Volts).

        So, yes it is a battery powered capacitor discharge system.

        The anti-reverse cutout spring is exactly that--it prevents the motor from running backwards. And it can, if the spring is missing.

        Be careful. One little screw-up can blow that $$$$ amplifier. It is especially sensitive to loose or corroded connections. Think battery cable connections.

        You need to know what you are doing when working on it. And the factory service manual is obsolete with outdated tests with outdated testers.

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        • #5

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          • #6
            Cool, thanks for the Info, that helps a lot. I know that I only have 7.5 volts going into the amp with key on. I'm guessing I probably have some bad connections somewhere. Thanks for the detailed response.

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            • #7
              I still cant get this thing to fire. I even tried putting the automotive coil and condenser ignition. I started it in the dark and saw sparks coming from the 2 yellow charging wires when I turn it over. Will that kill the whole ignition and cause a no spark situation? If so Ill just get a whole new stator.

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              • #8
                The wires are completely stripped of insulation right where they go into the stator.

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                • #9
                  Maybe some super glue to seal, then something to coat. I have some of that water proofing stuff advertised on TV, and it's really pretty good for a number of sealing uses -- might try something like that (some silicone sealant might do it). May finally need to replace the stator, but worth a try.

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                  • #10
                    Would that short out the ignition system?

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                    • #11
                      think that's what you are risking now, with the bare or chafed wiring.

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                      • #12
                        Cool, thanks, I believe this is probably my no spark problem.

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                        • #13
                          It's completely bare, I think I might have finally found my problem.

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                          • #14
                            So, have you figured out why you only have 7.5V going into the amplifier? I suppose a short to ground in the voltage regulator / rectifier / alternator stator circuit could draw so many amps away from the amplifier input that it causes a voltage drop to the input.

                            EDIT: Try unplugging the voltage regulator and see if that gives you proper amplifier input voltage while cranking. Unplugging the regulator removes it and the other yellow wire fed stuff from the picture (and any possible short to ground)

                            EDIT EDIT: You probably should also unplug the rectifier while doing the above test. Unregulated voltage could cause damage. Unplugging the rectifier disables the alternator so it can't be producing that unregulated output.
                            Last edited by F_R; October 7th, 2017, 12:06 PM.

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                            • #15
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                              Yea, I unplugged all of it. I finally got 12 volts at the amp. I'm still not getting spark. I have never had this hard of a time getting an engine to spark. It's nuts but, thanks for your input guys I appreciate it.

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