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  1. #1

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    Plug readings on break-in

    2001 GPR put over two hours on it at part throttle. Oside bill carb jetting, d plate, and riva flame arrestors. I thought it ran real well just want to see what you guys think about the plugs.
    first pic is rear cyl, right pic is middle
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  2. #2

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    It's not easy to get a good pic of a plug

  3. #3
    OzarkYamMonster's Avatar
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    They look good ... so far ... but still very new. How is the compression ?

  4. #4

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    All 120 I checked on cool down and when I got home.

  5. #5

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    I just don't want to be lean when I go full throttle

  6. #6
    Quote Originally Posted by rplaster View Post
    2001 GPR put over two hours on it at part throttle. Oside bill carb jetting, d plate, and riva flame arrestors. I thought it ran real well just want to see what you guys think about the plugs.
    first pic is rear cyl, right pic is middle

    You need to read here:

    plug_section_16.gif

    I use a $10 LED lit magna fine glass for close reads.

  7. #7
    Myself's Avatar
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    They look fine but it also looks like you idled a bit before killing it. Ride it around some with those plugs and load it onto the trailer. Tie it down and back into the water. Fire it up and run it at 1/2 throttle for about 15-20 seconds and pull the lanyard without letting off the throttle. Check plugs. If they look good go another 20 seconds at 6000 RPM. Check plugs. Then do full throttle for 5 seconds. Check plugs. 10-15 seconds, check plugs. If you can hold it wide open for 30 seconds and the plugs still show brown to black you're good to go. If at any time during this process the plugs go light tan to red or show any white or greyish deposits STOP! You're going for a honey to mocha color with a visible color line right at the bend of the electrode. This method allows you to sneak up on a wide open chop without lean seizing it in the middle of the drink and having a swim.

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