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  1. #1
    Frequent Poster cjburt's Avatar
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    Mar 2005
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    1997 Polaris SLT 780 acts like in limp mode but I don't think it is.

    1997 SLT starts and runs perfectly on trailer. Hits 6900 rpm's. Put it in the water and it won't run over 4000rpms. It still runs smooth and idles fine. Things I've done. First off the fuel guage is working properly and I have a full tank of fuel so it shouldn't be in limp mode. I have replaced the fuel pump and all fuel lines. I've tried to remove the tan wire as mentioned in someone else's post to eliminate rev limiter but no change plus I'm not getting high rpms anyway. Compression is perfect and even across all 3 cylinders. Spark testers show nice strong spark on all 3 as well.
    In my mind it seems to still not have enough fuel so maybe the carbs need to come off and cleaned (which looks to be a pain).
    Any thoughts would be appreciated.... I'm ready to give up on this one.

    Sent from my SAMSUNG-SM-G891A using Tapatalk

  2. #2
    Frequent Poster cjburt's Avatar
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    Re: 1997 Polaris SLT 780 acts like in limp mode but I don't think it is.

    I guess a better question would be. How should it act when in limp mode? As mentioned before I can hit 6900rpms on trailer but only 4000 in the water. Most rev limiters I've dealt with begin to miss at the set limit.

    Sent from my SAMSUNG-SM-G891A using Tapatalk

  3. #3
    PWCToday Newbie
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    Jun 2017
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    Re: 1997 Polaris SLT 780 acts like in limp mode but I don't think it is.

    780 rpm limiter is around 4500, Sounds like you might have a bad reed on one cylinder, when its in the water try removing one spark plug wire at a time to see if one cylinder is dead, make sure you put a spark plug in the wire & ground it when doing this.

  4. #4
    Frequent Poster cjburt's Avatar
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    Re: 1997 Polaris SLT 780 acts like in limp mode but I don't think it is.

    Quote Originally Posted by RLHDWEPWCGUY View Post
    780 rpm limiter is around 4500, Sounds like you might have a bad reed on one cylinder, when its in the water try removing one spark plug wire at a time to see if one cylinder is dead, make sure you put a spark plug in the wire & ground it when doing this.
    Ok thanks for the input, I'll try that when we get back in town

    Sent from my SAMSUNG-SM-G891A using Tapatalk

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