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Thread: WOT Plug check

  1. #1

    WOT Plug check

    Did a WOT plug check the other day on my 98 GSXL white engine after F/A and jet kit tuning. I was at WOT for about 3 miles then killed the motor at speed and pulled the plugs in the middle of the lake. They had a nice tan/brown color but what I notice was the plugs where not that hot they were just nice and warm. I'd figure they would be hotter than that ?? lake temp was around 65 degrees.


  2. #2
    96XPSS's Avatar
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    Unlike a car, they don't get that hot, at least not to hold.

    In the future when doing a plug chop...the first one should be within 2-5 seconds of planed wot. If you were lean it would have long siezd one running that far, for miles.
    Last edited by 96XPSS; 04-16-2008 at 08:03 AM.

  3. #3
    I did alot of back to the dock's for more tuning so I new it was good for a long run.

  4. #4
    96XPSS's Avatar
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    OK, I gotcha. From the way you typed...it seemed like your first one...

  5. #5
    I like to start with the motor on the rich side.

    I started with 100 & 165 jets and even had the HS cracked open. Ran great compared to the oem air box. It's still down alittle in rpms due to being too rich so I'm going to swap the 165's to 155's and tune from there.

    I'm also going to check the water regulator just to make sure it's good to go too.

  6. #6
    96XPSS's Avatar
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    I rejetted my 00XP from 85/170 to 90/165 a few weeks ago. The previous jetting was PPG's level one, which is too lean on the bottom. The ski would lean rev wot from idle when out of the water. The 90's corrected that. My plugs look chocolate brown now...maybe a bit too rich but I want to get some time on them before making any changes. Running 185 lbs compresssion too.

  7. #7
    Didn't they make you sign a contract forbidding the talking about jet sizes

    I didn't have a 90's but do have a the 155's, works out about the same jetting wise. Re-adjusting the low speed screw should dial it in for me.

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