Troubleshooting 2000 GSX RFI
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  1. #1
    PWCToday Guru mrwhipper's Avatar
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    Troubleshooting 2000 GSX RFI

    Hello all. I just bought a 2000 GSX RFI for backup parts for my wife's 99 GSX RFI. I bought it knowing it is not running well. It will only start when I hold it at half throttle then it will only run for about 5 seconds and shut off. It as also back fired when trying to start.

    I would like to get it running correctly or at least know what is wrong before I break it down.

    This what I know.

    1. The plugs are WET!
    2. I pulled the crank position sensor and there is metal shavings on it. (I cleaned the shavings off of it. I have not taken the the mag cover yet.
    3. Compression is 150 and 153
    4. The engine when running sounds tight. The crank and wrist pin bearings seem tight when I rotate the crank back and fourth.
    5. I can hear the fuel pump when I connect the DESS key
    6. Coil packs were swapped . Not the problem.

    I have not yet done any resistance testing on TPS or injectors.

    Where do you think I should start?
    Any guesses on whats wrong?


    I was doing a bunch of research and the TPS keeps popping up.

    Thank you for any guidance you can give me.

  2. #2
    Top Dog wire4money's Avatar
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    Re: Troubleshooting 2000 GSX RFI

    Does it rev up at all? I’ve seen a couple skis with stripped rotary valve gears that would idle (roughly) until the engine floods out (soaking the spark plugs).

  3. #3
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Troubleshooting 2000 GSX RFI

    First have the TPS reset/adjusted.

  4. #4
    PWCToday Guru mrwhipper's Avatar
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    Re: Troubleshooting 2000 GSX RFI

    Quote Originally Posted by wire4money View Post
    Does it rev up at all? I’ve seen a couple skis with stripped rotary valve gears that would idle (roughly) until the engine floods out (soaking the spark plugs).
    Does not idle at all.

    If I give it half throttle it will start and run for about 5 sec then quit.

  5. #5
    PWCToday Guru mrwhipper's Avatar
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    Re: Troubleshooting 2000 GSX RFI

    Quote Originally Posted by Grumpy Old Guy View Post
    First have the TPS reset/adjusted.
    That is what my research was leading to.

    DO you think it is work the money since I am breaking this thing down for a back up?

  6. #6
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Troubleshooting 2000 GSX RFI


  7. #7
    PWCToday Guru mrwhipper's Avatar
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    Re: Troubleshooting 2000 GSX RFI

    HAHAHA! I knew you would say that.. Thanks. I am going to check the resistance of the TPS and injectors this weekend and check back in.

  8. #8
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    Re: Troubleshooting 2000 GSX RFI

    Not sure if you have resolved this yet.... but I purchased a GTX RFI, 787, had great spark, would run for a second or so and then just flood out. I checked fuel pressure, new fuel blah blah blah, finally seemed to me like it wasn't getting enough air, and I would notice some smoke come out of the air intake. So I pulled off the intake and throttle body and turned the motor by hand at the pto and could see the rotary valve was not moving, pulled the motor out and found there is a dent on one blade of the rotary valve, so something hit it and had ended up stripping the rotary valve.

    Honestly, I would pull the throttle body so you can verify and see if the rotary valve is moving before doing any other testing.

  9. #9
    PWCToday Guru mrwhipper's Avatar
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    Re: Troubleshooting 2000 GSX RFI

    Quote Originally Posted by akinz View Post
    Not sure if you have resolved this yet.... but I purchased a GTX RFI, 787, had great spark, would run for a second or so and then just flood out. I checked fuel pressure, new fuel blah blah blah, finally seemed to me like it wasn't getting enough air, and I would notice some smoke come out of the air intake. So I pulled off the intake and throttle body and turned the motor by hand at the pto and could see the rotary valve was not moving, pulled the motor out and found there is a dent on one blade of the rotary valve, so something hit it and had ended up stripping the rotary valve.

    Honestly, I would pull the throttle body so you can verify and see if the rotary valve is moving before doing any other testing.
    I will check it out. THANKS!

  10. #10
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    Re: Troubleshooting 2000 GSX RFI

    You said wet? Wet with oil? Pull plugs, ground wires and crank over to see if oil coming out of spark plug holes. Very common issue where you centre crank seals are pouring oil into cylinders. Wont take long to foul plugs with oil.


    Sent from my iPhone using Tapatalk

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