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Thread: 951 gsxl 97

  1. #1
    PWCToday Guru Rconce01's Avatar
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    951 gsxl 97

    Low power won't rev past 2,000 rpm on the water.
    About a month ago a had a piece of metal of the Bendix wedge itself into the magneto and lock the motor and short the magneto. I put a new magneto in there and the ski revs outside the water but dies inside the water. Both cylinders have 125 psi and both spark plugs spark. Both cylinders are getting good fuel but the rear one refuses to fire. The magneto issue blew my 15 amp fuse on the MPEM .

    Can something electronically be damaged in the MPEM that would cause one cylinder to not fire?

    By the way the ski runs the same with or without the rear spark plug cable connected and the reeds are good. Also even if I connect and install the front spark plug and cable in the rear it still wont fire.

    What can be damaged when a magneto shorts and blows the fuse?

  2. #2
    PWCToday Guru Rconce01's Avatar
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    Re: 951 gsxl 97

    This is a before and after photo of the mess.

    20170312_162004.jpg20170312_164549.jpg

    By the way is there any specific order to the placement of the 3 yellow wires into the plug? I didn't mark them in any specific order and now I see this video and I'm thinking I may have needed to analyse the placement of each one relative to the other two.

    https://youtu.be/NnOO8YYrL_M
    Last edited by Rconce01; 05-14-2017 at 12:23 AM.

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    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 951 gsxl 97

    Blown head gasket ?
    Get your Fat Dudes T-shirts right here PM me for details !

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    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 951 gsxl 97

    There should be two 15 amp fuses that are part of the charging system.

    The rectifier is a probable cause for the 15 amp fuse to blow, and the charging
    system may be the cause of the running problem.

    You might need a multi meter with an amperage clamp to test this, and
    you will need the manual.


    Bill M.
    Last edited by wmazz; 05-14-2017 at 03:02 PM.
    Horsepower == Speed, RPM != Speed



  5. #5
    PWCToday Guru Rconce01's Avatar
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    Re: 951 gsxl 97

    Quote Originally Posted by wmazz View Post
    There should be two 15 amp fuses that are part of the charging system.

    The rectifier is a probable cause for the 15 amp fuse to blow, and the charging
    system may be the cause of the running problem.

    You might need a multi meter with an amperage clamp to test this, and
    you will need the manual.


    Bill M.
    OK Bill thanks I have clamp on ampmeter it can measure DC and AC current. In DC it shows 8 amp current while it's running and voltage climbs to 13.5v .

    I read something about getting some AC voltage to the battery when the rectifier is partially damaged.

    If I cut the 3 magneto wires the running problem should disappear if it's a rectifier issue?

  6. #6
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: 951 gsxl 97

    Quote Originally Posted by wmazz View Post
    There should be two 15 amp fuses that are part of the charging system.

    The rectifier is a probable cause for the 15 amp fuse to blow...


    Bill M.
    The blown 15 amp fuse was due to the shorted stator.

    Quote Originally Posted by Rconce01 View Post
    Low power won't rev past 2,000 rpm on the water.
    About a month ago a had a piece of metal of the Bendix wedge itself into the magneto and lock the motor and short the magneto. I put a new magneto in there and the ski revs outside the water but dies inside the water. Both cylinders have 125 psi and both spark plugs spark. Both cylinders are getting good fuel but the rear one refuses to fire. The magneto issue blew my 15 amp fuse on the MPEM .

    Can something electronically be damaged in the MPEM that would cause one cylinder to not fire?

    By the way the ski runs the same with or without the rear spark plug cable connected and the reeds are good. Also even if I connect and install the front spark plug and cable in the rear it still wont fire.

    What can be damaged when a magneto shorts and blows the fuse?
    Did you cut back the plug wires? Replace the spark plugs and check the resistance of the coil and the plug caps.

    Chester
    Speed is very expensive. How fast do you want to spend?

    Stand up:
    98 SXi-Pro

    Couches:

    96 XP
    86 X2

  7. #7
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: 951 gsxl 97

    Quote Originally Posted by Rconce01 View Post
    OK Bill thanks I have clamp on ampmeter it can measure DC and AC current. In DC it shows 8 amp current while it's running and voltage climbs to 13.5v .

    I read something about getting some AC voltage to the battery when the rectifier is partially damaged.

    If I cut the 3 magneto wires the running problem should disappear if it's a rectifier issue?
    You just have to disconnect the red wire.

    Chester
    Speed is very expensive. How fast do you want to spend?

    Stand up:
    98 SXi-Pro

    Couches:

    96 XP
    86 X2

  8. #8
    PWCToday Guru Rconce01's Avatar
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    Re: 951 gsxl 97

    Quote Originally Posted by Chester View Post
    You just have to disconnect the red wire.

    Chester
    Cool thanks , I did the 1/4" wire clip and the new plugs buy I didn't do resistance testing on the coil or the caps. I'm not sure which red wire my rectifier is built in to the mpem. I do see the 3 yellow that come out of the magneto housing.

    The fuse is good.

  9. #9
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 951 gsxl 97

    Quote Originally Posted by Chester View Post
    The blown 15 amp fuse was due to the shorted stator.
    After the good test of the charging system, I came to the same conclusion.
    8 amps a bit high. Spec is 5 amp at 5500rpm.

    Other than that, I didn't have any good input. I can't remember seeing a 951
    run at only 2000rpm.

    The only advice I can give is to check the basic easy stuff similar to Chester's
    Advice.


    Bill M.

    Check the fuel filler cap's gasket.

    Another simple test: Dump the fuel filter bowl onto a table and check for water.
    Water doesn't like to flow through carb jets. Then replace the filter o-ring.
    Horsepower == Speed, RPM != Speed



  10. #10
    PWCToday Guru Rconce01's Avatar
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    Re: 951 gsxl 97

    Quote Originally Posted by wmazz View Post
    After the good test of the charging system, I came to the same conclusion.
    8 amps a bit high. Spec is 5 amp at 5500rpm.

    Other than that, I didn't have any good input. I can't remember seeing a 951
    run at only 2000rpm.

    The only advice I can give is to check the basic easy stuff similar to Chester's
    Advice.


    Bill M.

    Check the fuel filler cap's gasket.

    Another simple test: Dump the fuel filter bowl onto a table and check for water.
    Water doesn't like to flow through carb jets. Then replace the filter o-ring.


    The charging system seems fine 13.5v dc and .3vAC running. I pulled the 3 magneto wires and I get 45 to 50 ohms on all phases . The magneto makes 35v at idle and if I Rev it got up to 80v AC . Same crap with all magneto wires pulled looses all power on the water. Can it be a broken reed valve? It's making a weird clacking sound in the motor.

    20170517_202450.jpg
    Last edited by Rconce01; 05-17-2017 at 09:42 PM.

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