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Thread: JS550 no spark.

  1. #1
    PWCToday Regular pillazilla's Avatar
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    JS550 no spark.

    I have had the worst luck with this ski. Or I am a terrible mechanic. Anyways my ski was running great one day on the hose except I forgot to take the battery off the charger while it was hooked up. Everything just died. I ended up having my starter rebuilt because of how slow it was turning over. Took it off and it was still spinning slow on a battery. Hooked everything back up and wow it spins great except I have no spark. I have replaced the Ebox and same thing. At first I figured it was maybe loose spark plug boot connector s. I had a broken pin on one of the 5 pins that come on the stator so I replaced them with Butt connections. Still no spark. I am losing my mind on this ski. I replaced the stator last year.
    Stock 550
    440 with 550 top end - coffman half pipe, Porting, 440 pump, SBN 44, Hi comp Head.

  2. #2
    PWCToday.com Is My Home Away From Home Rod Peters's Avatar
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    Re: JS550 no spark.

    You replaced the ebox, with another one? Did you check the fuse inside the ebox 15amp? Has the stator been inspected, loose or broken wires, windings. Timing set correctly?? Woodruff key been sheered off?? Do you have a lanyard set up, must be installed to start. Are your start/stop switch contacts clean, Couple of items to check
    

  3. #3
    PWCToday Regular pillazilla's Avatar
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    Re: JS550 no spark.

    Hi 15 amp fuse inside Ebox sounds like the best and most logical place to start where is that little fella?
    Stock 550
    440 with 550 top end - coffman half pipe, Porting, 440 pump, SBN 44, Hi comp Head.

  4. #4
    PWCToday Regular pillazilla's Avatar
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    Re: JS550 no spark.

    Also I had everything running great last week. Just all of a sudden can't get a spark.
    Stock 550
    440 with 550 top end - coffman half pipe, Porting, 440 pump, SBN 44, Hi comp Head.

  5. #5
    PWCToday.com Is My Home Away From Home Rod Peters's Avatar
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    Re: JS550 no spark.

    There is a round water tight black two piece connector, two wires coming out each side. My 550sx's have them I hope JS models have them as well.
    

  6. #6
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: JS550 no spark.

    Has the JS550 engine been apart recently?

    Do you test the spark with both plugs grounded at the same time? The small
    ground wire should be attached between the intake manifold and e-box while
    you are testing for spark.

    It is best to get 2 new spark plugs and ground them against the old spark plugs.

    Are the small ground wires fried?


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



  7. #7
    PWCToday Regular pillazilla's Avatar
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    Re: JS550 no spark.

    Hi Bill I have a wire grounded from the E box to the carb manifold.
    Stock 550
    440 with 550 top end - coffman half pipe, Porting, 440 pump, SBN 44, Hi comp Head.

  8. #8
    PWCToday Regular pillazilla's Avatar
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    Re: JS550 no spark.

    The 5 wires from the stator to the Ebox all look in place properly one of them... The gray one .. The pin broke so I just connected them with Butt connectors.
    Stock 550
    440 with 550 top end - coffman half pipe, Porting, 440 pump, SBN 44, Hi comp Head.

  9. #9
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: JS550 no spark.

    Pillazilla,

    You are sure you have no spark?

    Do an AC voltage test on the stator

    Test for ACV between the gray wire and ground, and test for ACV between
    the red wire and ground.

    Crank the engine with spark plugs in the head.

    One wire should have 30 to 35 vac, and the other should be greater than 60 vac.

    You said you replaced the ebox with a new or rebuilt unit?

    The only other tests are to check the spark plug wire continuity, check the spark
    plug caps, and to disconnect the black and white wire from the stop switch relay,
    or the terminal inside the ebox.


    Good luck, ask questions if you need too, and post the results.


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



  10. #10
    Resident Guru NielMcque's Avatar
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    Re: JS550 no spark.

    You said you left the battery charger connected while you ran it maybe you just fried the battery or the coil or the stator.
    Last edited by NielMcque; 06-20-2015 at 01:29 AM.
    1990 550 sx sbn 44 PJS head coffmans half pipe Coffmans water box solas 14-19 prop bored out pump nozzel wet wolfe cone jetnetics aluminium flywheel and shredmaster surf plate
    1995 FX1 milled head ss impeller shredmaster ride plate and toploader grate

    Need a good 550 topend

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