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  1. #1
    Live Fast wave15stx's Avatar
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    sparkplug color question

    i pulled my plugs today on my 08 yamaha sho and two where a dark tannish color and the other two where a light grayish white color i never seen it where the plugs are diferent colors my mods are c-1 wheel, powershot,air intake,exhaust etc.


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  3. #3

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    I'm not sure about the sho but most of the efi engine now use a wasted spark system. One coil fires positive and the other fires negative. There is always a color difference in the two plugs.
    Mike

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    L Carlson's Avatar
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    Quote Originally Posted by mikel70 View Post
    I'm not sure about the sho but most of the efi engine now use a wasted spark system. One coil fires positive and the other fires negative. There is always a color difference in the two plugs.
    Mike

  5. #5
    zx11rider's Avatar
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    Quote Originally Posted by mikel70 View Post
    I'm not sure about the sho but most of the efi engine now use a wasted spark system. One coil fires positive and the other fires negative. There is always a color difference in the two plugs.
    Mike
    that makes sense one line positive ,one negative, and the other must be a ground sounds like we need a electrician to figure this out.

  6. #6
    steve45's Avatar
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    Quote Originally Posted by mikel70 View Post
    I'm not sure about the sho but most of the efi engine now use a wasted spark system. One coil fires positive and the other fires negative. There is always a color difference in the two plugs.
    Mike
    A 'wasted spark' ignition system simply fires every revolution of the crankshaft. This means that the spark plug fires when the piston gets near the top of the cylinder between the exhaust and intake strokes.

  7. #7

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    wasted spark is where two cylinders fire at the same time one is firing on the intake stroke and the other is firing on the exhaust stroke. Most of the coils are wired in series, one is neg the other pos and the other wires are connected to each other.
    Mike

  8. #8
    steve45's Avatar
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    Quote Originally Posted by mikel70 View Post
    wasted spark is where two cylinders fire at the same time one is firing on the intake stroke and the other is firing on the exhaust stroke. Most of the coils are wired in series, one is neg the other pos and the other wires are connected to each other.
    Mike
    I'll buy your idea of reversed polarity causing the color change, but you don't have to have two cylinder/coils to have wasted spark. There are many single-cylinder engines that use wasted spark ignition.

  9. #9

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    Quote Originally Posted by steve45 View Post
    I'll buy your idea of reversed polarity causing the color change, but you don't have to have two cylinder/coils to have wasted spark. There are many single-cylinder engines that use wasted spark ignition.
    ok Your right but it still fires once on the intake stroke and once on the exhaust stroke.

  10. #10
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by mikel70 View Post
    I'm not sure about the sho but most of the efi engine now use a wasted spark system. One coil fires positive and the other fires negative. There is always a color difference in the two plugs.
    Mike
    What ?????? negative fire spark WTH is that???
    I must have missed that day at tech school...
    Could you explain that one to the class---We are ready to learn
    I have run a wasted spark system for years without any plug color diff. due to spark
    matt

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