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Thread: Spark Plug Life

  1. #1

    Spark Plug Life

    I was wondering how long everyone elses spark plugs last them.

    I have a 2005 Sportster SCIC and this summer I seemed to go through plugs a lot.

    Here is what happened several times: Boat would be running fine. I would shut the motor off, then go to re-start it later and it wouldn't start. I then change the plugs and the boat would start right up... The plugs had some wear and were discolored a bit.

    This happened to me 3 times this summer since May. Is it possible I have a bad batch of plugs? I use the NDK 4339's.

    Any other ideas as to what may be causing this?

    Thanks for any help!!!

  2. #2
    What type of plugs are other using with this engine? Has anyone been able to find a Platinum plug?

  3. #3
    did you save your old plugs? if so put them in @ try to run them, maybe it isnt a plug problem

  4. #4
    Quote Originally Posted by m1dtom View Post
    did you save your old plugs? if so put them in @ try to run them, maybe it isnt a plug problem
    Unfortunately I did not save the old plugs... This problem would happen when I would try to re-start the boat 5 to 10 minutes after turning it off. I had another person suggest it may have been vapor lock due to the extreme heat this summer? The thought here was that by the time I let the engine cool, changed the plugs, the vapor lock went away.

    Any other suggestions?

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