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  1. #1
    Canadian POWERHOUSE CanadianGPR's Avatar
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    Guru's - I Really Need help

    Here's my problem, I have a 02 gp1200r, motor is stock. The other day I was riding everything was fine the all of a sudden it would not rev over 5810 rpms. I thought it was a bad PV motor so I have replaced it but that didn't fix the problem, still won't rev over 5810, and the valves don't seem to open while riding. The motor cycles like it is supost too when it is shut off. Tried opening them by hand on the water and it still ran crappy. It has backed fired twice in the past month on the ramp when I was clearing the water out of it. Is it possible it have a broken reed petal. I have gas in the hull right under the stock air box. Also the exhaust sound has changed and is making a very deep growling noise. At first I thought my Free Flow had come off. Compression is the same across all three cylinders. The only other thing I can think it could be is the diaphrams in the carbs, my buddy has a gp800 and has had to replace them twice. Any help would be great, this is driving me nuts.


  2. #2
    Moderator RX951's Avatar
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    Backfires and gas in your hull is not good.

    I ain't no guru, but this is what I would do

    First dissconnect your battery (safety); due to possible fuel vapors in the hull
    Pull the pipe and get access to your carbs
    Inspect the rubber couple boot & clamps as you are pulling off the pipe too. [clean the pipe and mating surface of the rubber coupler well upon reassembly with alcohol or acetone.]
    Inspect the rubber boot & clamps at the bottom of the pipe to the waterbox also.
    Pull the air box
    Pull the carbs and check/inspect the reed petals.
    Check for obvious cracks, chips, frays or broken reed petals; a broken reed can reduce engine power & make it hard to start.
    Backfires can break or crack reed petals.
    None of the fuel lines should be loose or broken
    Inspect all 3 carb pulse lines from the case to carbs
    Inspect all the fuel lines to/from the carbs (be thorough !)
    Inspect the carbs for anything loose, broken or leaking.
    None of the bolts should be loose either upon dissasembly; carb bolts, manifold bolts ect...
    Check all your powervalve couplers.
    Pull your battery box out and check all the hose clamps to see if an exhaust hose; free flow, waterbox, ect.... blew off from a backfire...

    While everything is out, you may want to consider rebuilding those carbs if it has been a while and replace any brittle gaskets.

    Replace any fuel lines & fasteners that even look worn.



    How many hours are on this motor ?

    Its possible one of the backfires you had in the past month cracked a reed and that reed finally broke.......

    Anything anyone wants to add to help here
    .
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  3. #3
    Hydrotoys's Avatar
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    I think you got it covered. The reeds make a lot of sense.

  4. #4
    Canadian POWERHOUSE CanadianGPR's Avatar
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    Thanks for the advice guys, looks like I will be busy this weekend ripping it apart.

  5. #5
    Hydrotoys's Avatar
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    Leave that seat off the hull for a while too before you begin. Remember, gas vapours hug the bottom of the hull.

  6. #6
    Canadian POWERHOUSE CanadianGPR's Avatar
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    Thanks, I always store it with the seat off so condesation doesn't build up and rust everything.(and lately to vent the vapours)

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