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  1. #11
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 97 GTI carb settings?

    I have had to run carb bodies through my ultrasonic cleaner for that issue. Most times you can hold a finger over the larger hole, then spray carb cleaner in through the screw opening to help blow out the tiny holes. Most times, when a 'Doo low speed screw is at 1 turn out they will idle. Going in OR out only 1/2 turn makes a very noticeable difference in idle speed. I like to go out from 1 until I get the highest idle speed and then the engine starts to idle a bit 'rough'. Then go back in just enough to smooth it out. At my elevation, it puts almost every Seadoo at 1.25-1.5 turns out from seated. High speed is factory spec and then 'seat of the pants' feel, combined with a WOT plug chop.
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  2. #12
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    Re: 97 GTI carb settings?

    Pulled the carb and checked the 3 holes, all were open, no blockage changed the pilot to 70. did not change the pop off, still at 24psi. will test soon in the water at ramp

  3. #13
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 97 GTI carb settings?

    Does your bog occur when you give the engine throttle slowly?

    If not, how do you recreate the bog while testing?


    Bill M.

    Did you reuse the carb base gasket?
    Last edited by wmazz; 10-23-2021 at 03:49 PM.
    Horsepower == Speed, RPM != Speed



  4. #14
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    Re: 97 GTI carb settings?

    the bog occurs when I increase the rpm slowly, If i go fast it will rev to wot. this was a total rebuild. Both tanks were removed and cleaned, all fuel, oil and water hoses were replaced. The gasket was new

  5. #15
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 97 GTI carb settings?

    So this is really just a chance to learn more about your carburetor, than a
    problem that affects the performance of the GTi in normal riding conditions.

    At a dealership, this would not be warrantied. But it does demonstrate how
    in-tune you are to your ski. Through your posts it is pretty obvious that the
    low speed by-pass holes are lean, but not by defect or obstruction.

    Quote Originally Posted by homebrewdoo View Post
    Pulled the carb and checked the 3 holes, all were open
    3 holes total? including the pilot circuit.

    If so, either the circuit is lean in order to be smog legal, and/or the gap between
    the upper low speed by-pass hole and the main jet is too great for the jetting
    to transition. If so, it is possible that there is no repair.

    the only two solutions (possible) I see are increasing the low jet size, and
    readjusting the pilot screw to the new jet specs. Or rejet the carb to reverse
    jet specs. 1.5 seat, 115gr spring (55psi pop-off), 90 low jet, 155 main,
    1 turn +/- 1/4 pilot(low) screw, 1 1/2 on the high speed screw. I use this style
    jetting to increase acceleration and power on stock engines and racers.

    Another option is a 44, or 46mm sbn. They have 4 low speed by-pass holes,
    plus the pilot circuit. But a 44 or 46 should have a head stay (bracket) built to
    prevent the carb's mounting flange from breaking like the old Sea Doo's did
    when you installed an aftermarket F/A.


    Bill M.

    Pop-Off

    I have only come across 1 carburetor that had too much pop-off for the
    engine it was purchased for. It was a Walbro, and it started, idled, accelerated
    to a low rpm just fine, but it would not transition to the high speed circuit. It
    was like it had a rev limiter set to a few 1000 rpm.
    Horsepower == Speed, RPM != Speed



  6. #16
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    Re: 97 GTI carb settings?

    Tested the engine today at the ramp, with pilot at 70 and the pop off still at 24, did some slow revs from 1,500 to 6K, no bogs runs good. I pulled the carb when i got home and set the pop off to 32psi and will test again tomorrow.

  7. #17
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    Re: 97 GTI carb settings?

    Did a test run on the river today, runs good at all rpms. Thanks for all the help guys.

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