Green color on spark plug?

Discussion in '2-Stroke Engines' started by Fletch, Feb 13, 2011.

  1. Fletch

    Fletch Member

    I've searched not only here but the net to try to figure out what this green coloration is on my plugs, and I haven't come up with much.

    Does anyone know what this means? Does it have anything to do with the temp range of the plug being off? This plug here is a NGK BP6HS, and I've gotten this green coloration on other plugs as well.

    I read online that fuel additives can leave deposits, and I never had this before switching to Amsoil Saber. Could this be from the oil? Oxidization? I have no idea.

    Attached Files:

  2. motorpsycho

    motorpsycho Active Member

    it looks tan to me.
  3. srdavo

    srdavo Active Member

    I can see the green tint on the insulator part on the plug.

    If it was only green on the north side of the plug, I would suggest moss.

    Seriously....I have no clue.
  4. Fletch

    Fletch Member

    Ok... I'm gonna hit it with some Round-Up and hopefully that will take care of the situation.
  5. srdavo

    srdavo Active Member

  6. wildemere

    wildemere Member

    When tuning a 2 or 4 stroke engine, tuners look at the colour change at the base of the insulater, next to the metal body, deep inside the plug with a magnifier lens

    This indicates the combustion temperature.

    Its trial and error unless you have combustion software.

    It takes a trained eye or special sorfware to see this.

    Tip colour is just typically fuel type.

    Or rich or lean.
    Last edited: Feb 13, 2011