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  • need professional advice

    Hi guys, I could use some professional advise concerning my 1994 Johnson 200HP oceanrunner J200TXERK. In 2009 I had the motor remanufactured due to a snagged piston ring. The mechanic could not get spark or weak spark on one of the cylinders and jerked me around for two seasons where I would use it for my 2 week’s vacation but it just wouldn’t run right. I finally took it to an approved Johnson place for the low RPM’s where he replaced the power pack, trigger assembly, and coils. He got it to run right but suggested I reprop to bring the RPM’s up above 5000. After reproping down to a 15X15 I finally got the motor to run at 5200 RPM. That’s the history, now the problem. We did a compression test and found out that the #1 cylinder only has 60# pressure (the others all have 100#) and it looks as if the spark plug has never fired. That coil has no spark. Then we noticed that the wire harness from the trigger assembly had rubbed against the bottom of the flywheel and shorted the blue wire out (it was showing bare wires). So essentially, I have been running on only 5 cylinders. My questions:
    1. Any chance the compression can come back if I can get that coil to fire? It looks like it was receiving lubrication.
    2. Is it possible that I could get away with just replacing the power pack or would I have to change the trigger assembly again.
    I’m retired and can’t afford to do another rebuild. I hate to continually throw good money after bad. Any help would be greatly appreciated.

  • #2
    Thats is very low compression, might try to repair wires to get fire back to that cylinder and run some combustion chamber cleaner or Mercury Power Tune through engine. If its stuck rings that will help and recheck compression to see if helps.
    Regards
    Boats.net
    Johnson Outboard Parts

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    • #3
      That's what I would like to try but i'm not sure which component was damaged, the trigger or the power pack when the blue wire shorted.

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      • #4
        Can the damaged wires be temporary reapired to get running.
        Regards
        Boats.net
        Johnson Outboard Parts

        Comment


        • #5
          went back and looked and it was the white wire not the blue wire that had shorted. The motor runs fine on the 5 cylinders but there is no spark on #1. I'm not sure if a blown power pack can shut off 1 coil or not. Any ideas???

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