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  1. #1

    Engine bog above 4000 rpm, HELP!

    I have a 1998 Seadoo XPL. What I have done/checked so far. Fuel lines replaced, fuel filter cleaned, in-carb filters cleaned, tested float pop-off (23psi), holds PSI forever, cleaned carb good, Idles good, starts good, cut back plug wires to expose better wiring, plugs new with good burn indication, cleaned RAVE valves movement is free and smooth, checked oil pump alignment it's good.

    So here is what is happening. Runs good from idle to redline for like 2-5 minutes than it starts bogging down when you go full throttle or even 3/4 throttle anything above the 4000rpm range while under load. If I let it cool for 5 mintues its good for about 2-5 minutes of hard riding and starts to bog again. If I hold the throttle down it will finally catch up and give me full power. Its just just not snappy like a two stroke should be. I'm thinking RAVE vavle not opening up all the way but I've checked them and they seem smooth and free. What else can I check?

    Thanks


  2. #2
    96XPSS's Avatar
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    Rectifier. I think on 98's they were separate from the MPEM. Pull the red wire, start it and run it, and see if the bog disappears.

  3. #3

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    What do you mean red wire

  4. #4
    rotaxmech's Avatar
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    Bog

    Sounds like it's running FAT. Warm is fat and cooler is LEAN. Check high-speed screws. Should be all the way in. Make sure tank is venting properly too>

    CBL

  5. #5
    race24x's Avatar
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    96XPS where is the red wire (pics) I am looking at a similar problem

  6. #6
    race24x's Avatar
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    ttt

  7. #7
    race24x's Avatar
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    I found a gray box outside the coil box with a few wires in it, but there is no way to pull just the red wire I have to unplug a red and a black they are in the same plug

  8. #8
    steach's Avatar
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    Quote Originally Posted by 96XPSS View Post
    Rectifier. I think on 98's they were separate from the MPEM. Pull the red wire, start it and run it, and see if the bog disappears.
    RQ, the rectifier is separate (located on the front ign box) BUT it connects with a modular plug and no way(short of snipping it) to unplug the red wire.

  9. #9
    steach's Avatar
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    I would snip the wire. If the problem goes away you need a new one anyway. If the problem persists you can reconnect the red wire.

    ps. you will not charge the battery w/out the red wire attached.

  10. #10
    race24x's Avatar
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    Thanks I will try that

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