Engine Trouble Help Read my spark plug

Discussion in '2-Stroke Engines' started by Jcarr, Oct 28, 2014.

  1. Jcarr

    Jcarr New Member

    I'm 4 stroking at wot and am having trouble reading my plug. Here's a pic after 10 mins of wot. Insulator is a reddish brown. Just got new jets in the mail but afraid to install until I know if this is a definate rich problem

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  2. crassius

    crassius Well-Known Member

    looks rich to me
    Jcarr likes this.
  3. Jcarr

    Jcarr New Member

    Thanks! I just needed a second opinion. I have a speed carb and from my reading it comes jetted at a 70 so I just installed the dellorto 66 jet like recommended in other threads, gonna take it for a ride in an hour and I'll post results later. Also just put a fresh NGk bph6s in.
  4. Purple Haze

    Purple Haze Active Member

    Yes, you're runnin rich. Depending on your altitude, you may need a #64. Once you get WOT jetting down, you'll probably have to play around with the needle height to get a good idle and part throttle cruise mix.
  5. Jcarr

    Jcarr New Member

    Actually need to switch to a 68 I believe. It's definately running lean since the new jet as picture below. I'm getting serious bog down at 3/4 throttle and up. Good thing I ordered a few jets.... Putting the 68 in tonight.

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