1997 GTS 720 backfiring
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  1. #1
    PWCToday Newbie
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    1997 GTS 720 backfiring

    What is causing my 720 GTS engine to backfire, it will start and idle good up to 1/3 throttle, but starts to backfire at more then 1/3 throttle

  2. #2
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: 1997 GTS 720 backfiring

    When was the last time the carb was rebuilt/cleaned ?? When was the last time it ran right ??
    Last edited by Grumpy Old Guy; 05-26-2019 at 03:35 PM.

  3. #3
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    Re: 1997 GTS 720 backfiring

    I rebuilt the 1st carb two times, and that did not fix it, so i put another carb on it, same problem

  4. #4
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    Re: 1997 GTS 720 backfiring

    It was a used engine and i don't have history on when it last ran, comp at 150psi, starts good idles good.

  5. #5
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: 1997 GTS 720 backfiring

    New plugs, check rectifier, check fuel selector for clogs, replace fuel line, inspect pulse lines
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  6. #6
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    Re: 1997 GTS 720 backfiring

    Do you think it is going lean? i have installed new fuel lines, filter,pulse line, and installed a good fuel selector, Why rectifier?

  7. #7
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: 1997 GTS 720 backfiring

    Sounds like a carb issue,what kind of kit did you use ?? Does it have a accel pump ??

  8. #8
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    Re: 1997 GTS 720 backfiring

    does a 97 GTS have an accel pump?

  9. #9
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    Re: 1997 GTS 720 backfiring

    no accel pump. on 97 GTS one carb, Monday i will try to use the choke to check if it is running lean. if that helps i will order a carb kit and rebuilt the 2 nd carb

  10. #10
    PWCToday.com Is My Home Away From Home Cliff's Avatar
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    Re: 1997 GTS 720 backfiring

    Be sure the plugs that are installed are NGK BR8ES & gapped to 0.20”-0.24”

    RAVE Valve possibly has incorrect timing? Should have a 147* valve.
    Last edited by Cliff; 05-26-2019 at 07:00 PM.
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