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  1. #1

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    Where did my spark go???

    New owner of a 2005 STX12F. Ski was running great. Found the driveshaft bearing seals were shot, so pulled the motor and driveshaft to replace bearing and seals.
    Motor is back in, but will not start. Checking of spark plugs shows no spark on cylinders 1 and 4. Weak spark on cylinders 2 and 3. Injectors appear to be firing.
    Any ideas where to look?

  2. #2
    steve45's Avatar
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    Coil wires plugged in tightly?

  3. #3

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    Yep. Tested both coils today, identical readings. Swapped plugs and now have spark on cylinders 1 and 4, and none on 2 and 3 so definitely not coils. ECU perhaps?

  4. #4

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    Reading through the hundreds of posts here, I found someone with an identical problem. Their problem was solved by reversing the pulsing rotor on the end of the crankshaft. Guess what I'm doing tomorrow????

  5. #5
    steve45's Avatar
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    Did you mess with the rotor when you had the engine out??? If not, and it was running good before, I don't think that's your problem.

    See what smokeysevin thinks about it before you tear into it.

    EDIT: Read this before you tear into it: http://greenhulk.net/forums/showthread.php?t=105268

  6. #6

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    It looks like you are saying that you swapped the placement of the plugs and the problem moved, is that right?


  7. #7
    steve45's Avatar
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    Quote Originally Posted by DealsGapCobra View Post
    It looks like you are saying that you swapped the placement of the plugs and the problem moved, is that right?
    I don't know if he's talking about spark plugs or coil plugs.

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  9. #8

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    In either case I sure would expect the parts he moved to be suspect.

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  11. #9

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    Yes, I removed the pulser rotor when the motor was out. And put it back on backwards! DOH.
    Flipped it around and sparking from both coils now. Result.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  12. #10

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    Interesting. Im glad you got it figured out.

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