Home Forum Ask A Member 1980s Evinrude 7.5 hp no spark

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  • #10147
    mgsolakis
    Participant

      I’ve got no spark on the bottom cyl. The motor is an 80s 7.5 by Evinrude and runs well on the top cyl. Compression is good. I tested the spark and got nothing from the bottom at all. Where should I look.

      #77397
      frankr
      Participant

        US MEMBER PAY BY CHECK

        Try swapping the coils to see if problem follows the coil. If it does, bad coil. If it does not, bad power pack.

        #77403
        mgsolakis
        Participant

          Thanks Frank, I assume the coils are what the spark plug wires attach to.

          #77408
          frankr
          Participant

            US MEMBER PAY BY CHECK
            quote Severi:

            Thanks Frank, I assume the coils are what the spark plug wires attach to.

            Yes. Not knowing they model year, if the plug wires are separate items, swap them also.

            #77425
            fleetwin
            Participant

              US Member

              Check all the simple stuff first…Powerpack and coil grounds, check them with an ohm meter set on the low scale. You should do the stop switch elimination test also. I realize it is not likely that a partially grounded stop switch would affect just one cylinder, but stranger things have happened. Pull apart those rubber amphenol connections, make sure the pins are not bent and both pins and sockets are pushed completely into the rubber connectors. Do not use grease or oil sprays to lube the inside of the rubber connectors making them go back together easier, this will just create arcing/shorts down the road. Soak both halves of the rubber connectors in rubbing alcohol before reassembly, then they will slide together easily. You could check the resistance of both coils, the charge and sensor coils also. You could also swap coils like Frank prescribes, but this is tough without the amphenol tools or the extension leads. Please do not cut the ignition leads in order to swap them around or do the stop switch elimination test.
              Once all this is done, you will probably be ordering a new powerpack I’m sure….But, if you just went ahead and ordered the pack without checking the simple stuff, the problem would turn out to be simple and you would be $100 poorer….

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