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Thread: Engine Seized

  1. #1
    Matrix 200 suparoo's Avatar
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    Engine Seized

    Out for my last ride of the season and what do you know. Had done about 70 miles for the day without a problem about 5 mins away from the ramp in some really flat water with the engine pulling about 5500rpm when it all came to grinding hault. Here's what I found when I pulled the head. Any ideas what's caused this ?? The cylinder that picked up was the front one. Can I just hone off the ali from the piston and chuck a new piston in ?
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    Last edited by suparoo; 04-28-2008 at 01:34 AM.


  2. #2
    ph2ocraft's Avatar
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    You're running lean.
    When was the last time the carbs were cleaned?
    What octane fuel are you running?
    What are you using for oil in your ride?
    What changes if any have you made since stock?

  3. #3
    Bernie's Avatar
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    Use a bit of wet +dry locally and then hone it up

    Check you oil pump adjustment and give it a bit more .Might pay to fatten it up at the top as well

    Bernie

  4. #4
    Matrix 200 suparoo's Avatar
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    Running 95 octane with genuine polaris oil. Cleaned the carb filters about 10 hours ago. The mods are fairley unknown to me had the matrix kit fit by Baxter in 2004 about all a know.

  5. #5
    Matrix 200 suparoo's Avatar
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    After I have reasembled it, it has been suggested that I bore into the exhaust bosses and thread them so we can fit an oxygen sensor to each cylinder and run it to see whats happening with each carb has anyone done this before. I also fitted a new oil pump cable about 5 hours ago. I matched up the line on the caseing with the line on the pump arm there is also a dot on the arm which if lined up would give more oil should have I used that mark instead. But it was a few hours ago with no problems.

  6. #6
    ph2ocraft's Avatar
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    I'd go to a better oil, synthetic at minimum as it will keep the engine temperatures down. I don't remember how much cooler my Matrix runs with Amsoil Dominator but it was substantial.
    I run my 04 at the mark (40:1) and it does fine, I will usually put a splash of oil in the fuel tank just to be safe. Not too much as you will get a lean fuel mixture due to the displaced fuel.
    Get a fuel pressure gauge and measure your fuel pressure, it needs to be between 4 and 6 pounds at WOT, any lower and you're not supplying enough fuel.

  7. #7
    Matrix 200 suparoo's Avatar
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    Is 40:1 the two lines or the line and the dot?

  8. #8
    Matrix 200 suparoo's Avatar
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    What do you mean by WOT

  9. #9
    ph2ocraft's Avatar
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    Quote Originally Posted by suparoo View Post
    Is 40:1 the two lines or the line and the dot?
    Mine has just one line on the arm, which I line up to the the mark on the oil pump housing.

  10. #10
    ph2ocraft's Avatar
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    Quote Originally Posted by suparoo View Post
    What do you mean by WOT
    Wide Open Throttle, it only requires a short burst at WOT.

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