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  1. #1
    PWCToday Regular
    Join Date
    Jun 2013
    Location
    Oregon
    Posts
    91

    951 Ignition timing - Should I change from stock?

    Hi All,

    I am considering modifying my 951 ignition timing. It runs well but I noticed the MPEM programmer can make adjustments. Maybe there are gains to be made.

    What timing would you recommend for my below setup?


    Mods:
    Proks
    Jet kit
    Stock head shaved and quench mod
    Mildly ported cylinders
    ~150 compression
    .5mm overbore
    Carbon Tech Reeds
    Solas Concord 15/20 impeller
    92 Octane fuel with Amsoil Interceptor oil

    MPEM Programmer Settings:
    951 Ignition Timing Settings.jpg






    Last edited by jgkurz; 08-10-2014 at 09:50 PM.

  2. #2
    PWCToday.com Is My Home Away From Home justforfun's Avatar
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    Re: 951 Ignition timing - Should I change from stock?

    You need to check the base timing before you ad more timing to it. The numbers mean nothing after the stock engine has had parts changed like cranks or flywheels that can be off a tad. Nothing has been changed the timing will be fine. I ran a MSD you can change quite a bit as long as it stays 15 degrees or under at 7K running pump gas.

  3. #3
    PWCToday Regular
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    Oregon
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    Re: 951 Ignition timing - Should I change from stock?

    Thanks for the response. The MPEM Programmer says my timing is on setting #5 which is -1 deg. I assume this is NOT what you meant?

  4. #4
    PWCToday.com Is My Home Away From Home justforfun's Avatar
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    Re: 951 Ignition timing - Should I change from stock?

    The -1 is where seadoo corrected the timing just say the engine was rebuilt now that minus 1 might not be the correct timing for the engine that is why you can change a few degrees. The 951 likes timing down low it makes a difference you can feel. Crappy pump gas
    if it runs good best to leave it alone you don't have enough ridding season in Oregon you want to make use of every good day and not be working on your ski.

  5. #5
    PWCToday.com Is My Home Away From Home fastgas's Avatar
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    Re: 951 Ignition timing - Should I change from stock?

    As already pointed out, you need to determine your mechanical timing before manipulating your electronic timing. Which year/model ski do you have? 98 and 99+ have different timing curves. I have my 98 set to +3 degrees over base and it runs great. It was previously set to -2 overall and it ran like crap.

  6. #6
    PWCToday Regular
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    Re: 951 Ignition timing - Should I change from stock?

    I have a 98.

  7. #7
    PWCToday Regular chris8103's Avatar
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    Re: 951 Ignition timing - Should I change from stock?

    Quote Originally Posted by fastgas View Post
    As already pointed out, you need to determine your mechanical timing before manipulating your electronic timing. Which year/model ski do you have? 98 and 99+ have different timing curves. I have my 98 set to +3 degrees over base and it runs great. It was previously set to -2 overall and it ran like crap.
    Hi fastgas, you have set the timing at +3 degrees with start to 0 or +3 with start to -2 so the timing is +1 degree ?
    I my mpem is set to -2 and the engine run like crap, there is timing problem ? How to measure to mechanical timing ?
    My first jet : GTX DI 2000
    Current jet : RXT 215 2007
    Assembly in progress GTI 215 2008 powered by chris

  8. #8
    Resident Guru
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    East of DFW
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    Re: 951 Ignition timing - Should I change from stock?

    The Seadoo manual covers how to set timing. As per the manual, "The timing mark on the PTO flywheel refers to the physical component position when the spark must occur. The MPEM must be synchronized with the mark." After this you can advance the static timing. So first you need to mark the flywheel where it is supposed to fire btdc. Then strobe light to adjust the mpem to line up at mark. Then advance however much you want to after it is set.

    All of my 951 motors were either marked with a 5, 4 or 1. They also have been advanced to either five degrees but slotting flywheel mounting holes or adjusting the timing to full advance on mpem.

    So the case marked with a 5 was advanced 4 degrees.
    Marked with a 1 was advanced 3 degrees.
    marked with a 4 was advanced 2 degrees.
    Or slotting flywheel and advance 5 degrees from original stock setting.
    Last edited by Seadoo timebomb; 06-09-2018 at 03:13 AM.

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