Spark Plug Diagnosis

Discussion in '2-Stroke Engines' started by JohnnyLoves, Jul 4, 2008.

  1. JohnnyLoves

    JohnnyLoves Member

    I thought I was pretty good at juding spark plugs, but mine is really confusing me. There is a portion of what looks like wet deposits indicating a rich mixture, so I set my carb to the leanest setting. However, the plug itself is very white indicating a hot mixture, this is troubling considering I'm already using 16:1 or 7 oz to 1 gal.

    I think I need a 2nd opinion here, please check attached pic.

    Attached Files:

  2. wildemere

    wildemere Member

    Run it again at a normal oil ratio, 16:1 is very oily, giving it that lean & wet look you get at the same time.

    32:1 is a lot fuel richer as far as the engine is concerned as oil don't combust so 16:1 would burn hotter than 32:1
  3. JohnnyLoves

    JohnnyLoves Member

    I was under the impression more oil ment a cooler engine.
  4. wildemere

    wildemere Member

    Oil displaces fuel giving a lean condition as you increase the ratio.

    It is actually possible to fine tune your mixture with oil ratio.