SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Jul 2004
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    1

    Default gp1200 hesitation

    on a 97 gp1200 after sitting at idle for a while, if i punch open the throttle it hesitates for a second, then revs up and goes. does this mean the mixture is too lean? if so should i adjust the high speed, low speed, or both screws?

  2. #2
    Joined
    Mar 2003
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    SBT
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    21,555

    Default Re: gp1200 hesitation

    Turn your low speed screws out 1/4 turn and see if it improves.
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  3. #3
    Joined
    Apr 2003
    From
    Delaware
    Posts
    242

    Default Re: gp1200 hesitation

    look down the carbs while it's idling. Is there fuel dribbling down to the throttle blades?
    J-me
    05 Bayliner 175
    98 GP 1200 Yamaha factory support hull, Lamey engine, Skat pump

  4. #4
    Joined
    Sep 2018
    From
    Tampa
    Posts
    12

    Default Re: gp1200 hesitation

    Per someone's advice at sbt I went with 2.3 ns 95g springs 100 pilots 135 mains. It runs WAY better. However, the missing problem still exists. Tried all kinds of low speed settings to no avail. It seems to like 1 turn out the best. This problem was also happening before I rebuilt the carbs. I changed my fuel filter out. Is it possible it could be something to do with the driveline, (pump etc) after I've gotten on a plane and it's happened once, I can punch the throttle and accelerate no problem. I don't see any fuel dribbling down inside the carbs. Thanks alot for the help
    Last edited by 2stroker1200; 10-22-2018 at 05:43 PM.

  5. #5
    Joined
    Sep 2018
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    Tampa
    Posts
    12

    Default Re: gp1200 hesitation

    here's a short video I made, it happens right at 0:04 when I go from 1/4 throttle to 100%

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