2002 Seadoo Sportster 951 Carbed - No Spark
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  1. #1
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    2002 Seadoo Sportster 951 Carbed - No Spark

    I’ll try to summarize everything I’ve done as shortly as possible;

    - Replaced Pickup coil and stator.
    - Cleaned Pickup points on the rotor. They were corroded from water it looks like.
    - New battery this year.
    - New spark plugs, wires, coils, etc. (entire rear electric box).
    - Cleaned all grounds.
    - Ohmed out each wire to make sure no shorts from mag cover back to the box, grounds included.
    - Ohmed pick up coil (242 ohms).

    *Newest updates/findings;

    - I get 4.6volts at both white wires at the coils when both white wires disconnected and boots removed from the spark plugs.
    -If I connect the boots on the plugs and take a voltage reading at the white wires, it shows more like 3.8 volts.
    -If I leave boots off and hit start button with white wires off (won’t crank obviously) then voltage jumps to 11.9volts.
    -If I contact boots and white wires to the ignition coils then crank and measure white wire voltage, I show nothing.

    Does this sound like a short or something? I don’t understand how there is 3-4volts before I push to start.

    The previous owner put in an aftermarket Arieltek MPEM and I’m wondering if that isn’t part of the problem too. The rotor is a Denso rotor.
    Last edited by Airman89; 07-20-2022 at 06:06 PM.

  2. #2
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    7078DBC0-7AF8-4F23-83AA-75BA0CADFC92.jpeg

    Second question, is this trigger coil too far from the pick up points on the rotor to get a pulse? It seems like a rather large gap.

  3. #3
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    About 1mm is normal. When the gap is that wide, the pick-up
    has problems or will not register the reluctor.


    Bill M.

    Did you test the old pick-up coil with an AC volt test?.
    Last edited by wmazz; 07-22-2022 at 03:06 AM.
    Horsepower == Speed, RPM != Speed



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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    Unfortunately I didn’t measure the AC voltage. The reason for replacing the stator/pickup assembly was mainly because of the stator being in rough condition. I cranked over and tested the AC volts of this new pickup and I get nothing.

    Is there a way to adjust the pick up coil or is it possible that the rotor is the incorrect rotor?

  5. #5
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    Update:

    I bent the tabs on the pickup coil and now it reads on the tachometer when cranking. The one I bought off of eBay was bent the wrong way leaving too large of a gap.

    Now, I still have no spark. Over 5 times it would slightly fire the second I let off of the start button but when I am cranking it never even slightly fires. What could this mean? A short somewhere? In the switch itself?

    A few times while cranking it would stop cranking (before I let off of the button). A few times it would stop cranking and beep twice before I let off of the button too.

    But would any of this affect the spark?

    Thanks!

    Adam

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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    Anyone have any ideas?

  7. #7
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    1-spark is new??

    I don't trust your new stator. It is new, not used?

    What previous testing pointed to the stator?


    Bill M.
    Horsepower == Speed, RPM != Speed



  8. #8
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    Quote Originally Posted by wmazz View Post
    1-spark is new??

    I don't trust your new stator. It is new, not used?

    What previous testing pointed to the stator?


    Bill M.
    Hey Bill,

    the stator wouldn’t cause it to not start though correct? Yes it is new. The old one had corrosion so I replaced as a precaution when I was inside the magneto cover. It is still not firing up but it does now register 400ish rpm’s on the gauge when I crank it over. Still no spark. Wires resistance is good.

    Is there any wiring that can cause it not to fit from up near the start button? I notice the guy before me ran a wire from negative on battery with an inline fuse straight up to the controls under the drivers storage compartment.

  9. #9
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    Quote Originally Posted by Airman89 View Post
    Hey Bill,
    the stator wouldn’t cause it to not start though correct? Yes it is new.
    But the large air gap would. Replacement stators with the wrong
    pick up coil seems to be a trend these days.

    It is a battery powered ignition, so long as the charging system is
    working properly, the pick-up coil, MPEM, ignition coil and stop
    switch are the ignition system.

    There maybe sensors or safety switches that are connected to
    the mpem too, but the large air gap is a real problem.

    Quote Originally Posted by Airman89 View Post
    Is there any wiring that can cause it not to fit from up near the start button? I notice the guy before me ran a wire from
    negative on battery with an inline fuse straight up to the controls under the drivers storage compartment.
    I don't know. Maybe Myself or WFO has something to contribute?



    The only other thing I can suggest is testing the primary coil wires
    from the mpem with a peak voltage adapter for your multi-meter.

    If the peak voltage from the mpem is significantly less than ~150v dc
    something on the mpem side (pick-up coil, MPEM, stop switch, etc.) are
    the problem. If it is equal to or greater, something on the ignition coil
    side (maybe a ground wire) is the problem.


    I have a circuit, if you want to build one yourself.


    Bill M.
    Last edited by wmazz; 09-03-2022 at 01:07 AM.
    Horsepower == Speed, RPM != Speed



  10. #10
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    Re: 2002 Seadoo Sportster 951 Carbed - No Spark

    It's been my experience that aftermarket electrics are a crapshoot at best. I'll take good used oem over aftermarket any day on most electrics. I would first get a known working oem stator and mag cup. If that doesn't work then I would yank the aftermarket MPEM and try that. It's VERY hard to troubleshoot these electrics when there's sketchy aftermarket parts involved.
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