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  1. #1

    Default Nissan ns5b wet plug

    I've taken carb apart 2 times and clean it very well as well as blowing compressed air thru all opening after cleaning. It will start fine but runs rougher than I think it should. Pull plug and its gas wet. I'm curious as to weather fuel pump diaphragm could be bad and dumping fuel back onto cylinder and wetting the plug?

  2. #2
    Join Date
    Mar 2019
    Location
    Ottawa Canada
    Posts
    549

    Default Re: Nissan ns5b wet plug

    Might be possible you have weak spark? Is there a mixture screw? Did you set the float properly?

  3. #3
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,921

    Default Re: Nissan ns5b wet plug

    No, not possible the fuel pump on these ancient 2-strokers is integral with the carb. A bad diaphragm would cause fuel starvation. So, either the carb has an issue, such as float height, or you have poor spark.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  4. #4

    Default Re: Nissan ns5b wet plug

    What is the proper height of the float? How do you tell if the spark is weak? By color?

  5. #5
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,921

    Default Re: Nissan ns5b wet plug

    Invert the carb casting, and the float should be parallel.
    I test spark with a spark gap tester. What color is the plug?
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  6. #6

    Default Re: Nissan ns5b wet plug

    Plug is new so it's still white. I was referring to the color of the spark itself. I haven't really checked the sparked because it's running. I was wondering if a blue spark was weak or strong. Or is a white spark weak or strong.

  7. #7
    Join Date
    Mar 2019
    Location
    Ottawa Canada
    Posts
    549

    Default Re: Nissan ns5b wet plug

    Blue spark is good. White spark in the older points ignition would Indicate a bad condenser. Orange spark would Indicate a weak coil

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