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  1. #1

    1999 Seadoo Challenger Oil in Cylinder 1 fouling out spark plugs

    Hi All,

    I'm having an issue with a 99 Seadoo Challenger (787 Seadoo motor) where it constantly fouls out the spark plug in cylinder 1 after sitting for a few hours. I can get it started by removing the plug, turning the engine over for a few short 5 second bursts to remove the oil then putting in a new plug. Once the new spark plug is in it will start right up but smokes a lot due to the excess oil.

    Has anyone come across this or a similar issue before? I'm hoping it's something simple such as a bad gasket...I'm just not sure where to start. Any help would be appreciated!


  2. #2
    Tiny's Avatar
    Join Date
    Sep 2006
    The Atl
    Could be a bad crank seal or a bad rotary valve shaft seal. Most likely a bad crank seal if the oil is only in 1 cylinder. If it was a bad RV shaft seal, oil would be in both cylinders.

  3. #3
    yup, what he said ^^^

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