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Thread: Plug gurus - what does this tell you?

  1. #1

    Plug gurus - what does this tell you?

    Very contrasting plug burn. How should it be interpreted?



  2. #2

    Re: Plug gurus - what does this tell you?

    Non red one runnnig leaner than the other ?

    What’s a new plug look like

  3. #3

    Re: Plug gurus - what does this tell you?

    New is just shiny silver

  4. #4

    Re: Plug gurus - what does this tell you?

    That's usually additives being burnt off to het that colour. Not normally something to worry about. Have you recently started using any or changed fuel types?

  5. #5

    Re: Plug gurus - what does this tell you?

    Standard 91, stabil and Merc synthetic oil

  6. #6

    Re: Plug gurus - what does this tell you?

    Drop the Stabil unless it is going to be stored a fair while >6 weeks.
    I suspect the "cleaner" plug is the top cylinder...hotter burn in upper cylinders normally.
    Jack.

  7. #7

    Re: Plug gurus - what does this tell you?

    They look hot and dry to me, there is a chart online that gives explanations on plug colours.

  8. #8

    Re: Plug gurus - what does this tell you?

    Quote Originally Posted by tunaticer View Post
    Drop the Stabil unless it is going to be stored a fair while >6 weeks.
    I suspect the "cleaner" plug is the top cylinder...hotter burn in upper cylinders normally.
    Totally agree

  9. #9

    Re: Plug gurus - what does this tell you?

    The earlier you apply the stabil the better
    I keep 40l for the generator and every 12 months put it through the ride on lawn mower and refill for another year

    And use the boat fuel in the ride on but using tote tanks makes that easier to do

    Didn’t realise stabil can make it burn so much differently

  10. #10

    Re: Plug gurus - what does this tell you?

    I like stabil. Helps me sleep at night not worried about poor fuel quality breakdowns.

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