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Thread: Lost 400 RPM's

  1. #1

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    Lost 400 RPM's

    I have lost 400 RPM's. I have checked the compression. OK! It happened all at once. It was running fine. I restarted after about 3 hours and they were gone.

    Any solutions?


  2. #2
    WATER WOODY's Avatar
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    What boat?
    What mods?

  3. #3
    txgp1300r's Avatar
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    not enough info...reeds , efi ,leak , pump shoe???

  4. #4
    philip_gpr's Avatar
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    good chance it is the power valves

  5. #5
    ABBOTT's Avatar
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    more info please.

  6. #6

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    I have a 2001 GP1200R.

    Riva Heads 145-150 psi
    Riva ride plate new style modded by Jim
    Riva trim tab
    Riva Stainless Wear Ring
    Riva Intake Double Bar Grate
    Sealed Pump
    Flame arrestors
    05 pump w/dynafly 14/19.5 balanced by Carl
    Jetworks mod (**** good feeling) props to Fercho
    D-plate and chip
    Rejetted carbs 120main-110pilot-95gram-2.0needle
    stepped stock sponsors
    [email protected] 1/4 tank of fuel

  7. #7
    TRIPLE PIPES ARE 2-STROKE TURBOS allcool's Avatar
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    Quote Originally Posted by slambmx
    I have lost 400 RPM's. I have checked the compression. OK! It happened all at once. It was running fine. I restarted after about 3 hours and they were gone.

    Any solutions?
    Phillp is right, sounds like power valves.
    Check compression with the valves closed and then with them open.
    Or just pull the heads and have a peak

  8. #8

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    It was in the power valves. One of the screws came out and let the power valve drop. It did not hurt the motor. Thanks for all the help.
    James

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