SBT Jetski Engines, Parts & Accessories

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  1. #1
    Apr 2013

    Default Poor Performance

    My 1998 STX 1100 is not running well. Seems like it is starving for fuel if you hit the throttle hard. If you pull the throttle lever slow the machine will gain speed and run up on plane. I just installed a new fuel pump. Gas has been pumped out and new fuel installed. I should say that I pre-mix the fuel and oil. New plugs installed when I uncovered the machine. I do that each year. Compression is good. 125 to 130 PSI in all three cylinders. All fuel lines on machine replaced at the end of last season. It ran well last season after the new fuel lines were installed. The machine has a fuel primer that worked well but now does not work as good as in the past. Could the fuel system be sucking air cause a lack of response when trying to accelerate. This machine has always performed well. I have owned the machine for 12 years. Any ideas would be appreciated.

  2. #2
    Jun 2016

    Default Re: Poor Performance

    Yes the symptoms your stating sound to be an air leak somewhere. Best thing to do is let it idle and grab some carb cleaner and spray around the engine, seal, and the fuel lines you just did to make sure they aren't cracked, see where the idle changes and that will be were your leak is. Also check the reeds make sure none of them are cracked as well.

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