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  1. #1

    Join Date
    Jan 2021

    Where did my sparks 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

    Join Date
    Jan 2021
    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?

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