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  1. #11
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: First attempted start of JS550

    Quote Originally Posted by Stovebolt View Post
    I'm going to buy some new fuel lines and run directly from the tank to the carb with a small filter.
    I wouldn't do that. Just verify that the fuel pet**** works and leave
    it connected.

    Did you replace the needle and seat in the carb, and are you familiar
    with the lever position. If it is low, that would be an issue.

    Is the rev limiter hooked up? It should be connected to the return line
    from the carb, and the return line continues from the rev limiter to the
    fuel tank. The rev limiter should have a ~1/8" hose connected to the
    top of the carb.


    Bill M.

    Quote Originally Posted by Stovebolt View Post
    Rebuild = I bought this ski as a non-running project with a hole in the hull.
    I've never heard it run but I have rebuilt everything under the hood, literally.
    Besides gaskets did you purchase new main seals, and pistons?
    Last edited by wmazz; 08-09-2021 at 01:43 PM.
    Horsepower == Speed, RPM != Speed



  2. #12
    PWCToday Newbie Stovebolt's Avatar
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    Re: First attempted start of JS550

    The fuel pet*** inspection will have to wait until this weekend. I replaced the on/reserve switch during the build but didn't check to make sure it was working properly. I filled the fuel filter with fuel which leads directly to the carb pump. If that were being sucked dry before the ski died, I could understand there being some blockage elsewhere in the fuel line, but the fuel level in the bowl has never dropped. Which leads me back to the pump. I did not replace the needle and seat when I rebuilt the carb, but they looked clean with no markings and the lever looked to be level with the surrounding surface.

    The rev limiter is hooked up, but has never been tested. Should the pulser tube have any fuel in it? That is still completely dry.

    I just need to spend some more time working my way through the system to see where it's hung up, but in a 100 degree garage that comes in short bursts. More to come next weekend.

  3. #13
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: First attempted start of JS550

    Quote Originally Posted by Stovebolt View Post
    I filled the fuel filter with fuel which leads directly to the carb pump. If that were being sucked dry before the ski died,

    I could understand there being some blockage elsewhere in the fuel line, but the fuel level in the bowl has never dropped.

    Which leads me back to the pump.
    The only way that it could be the pump, is if you reassembled the carb incorrectly.

    Did you replace the pistons and rings, and/or main seals?


    Bill M.
    Last edited by wmazz; 08-10-2021 at 01:03 AM.
    Horsepower == Speed, RPM != Speed



  4. #14

    Re: First attempted start of JS550

    Sounds like a leak Down test is needed!

    Www.groupk.com a wealth of information on that site. A lot of good reading also. The article on gasoline is a good one(IMO).


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    1995 FX-1: Pro-Tec chamber~Skat swirl~Pro-Tec plate~Blowsion Destroyers

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  5. #15
    PWCToday.com Is My Home Away From Home Bionic racing's Avatar
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    Re: First attempted start of JS550

    Check compression

  6. #16
    Resident Guru RenoJetTech's Avatar
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    Re: First attempted start of JS550

    Ok BN44 ? I wonder if there is mix up on the pump side diaphrams and gaskets
    '88 550-ride plate,intake grate,intake manfold,carb
    '96 GTX-1mm overbore,F/a's,intake grate,port timed for mid and top end
    '95 FX 1- usually take this motor to 753cc with exhaust porting and reeds

  7. #17
    PWCToday Newbie Stovebolt's Avatar
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    Re: First attempted start of JS550

    OK. I feel a bit sheepish. I had a couple hours on Sunday afternoon to tinker with the ski. I bought and installed some clear fuel lines and an inline filter, removed the OEM filter, pulled the ON/RES switch off and checked that, and checked the fuel tank connections. As I was doing that last check, I noticed the RES line was connected to the shorter pick-up tube. Hmmmmm. I had only put a little fuel in the tank and had it set to RES to test the engine, so I was sucking away on an empty tank.

    I switched the hoses, and it fired right up, and filled the garage with smoke!!! YAAAYYYY!!! Time to do a little work on the impeller wear ring and find some water to drop it in so I can tune the engine.

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