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Thread: GP800R Top End

  1. #1

    GP800R Top End

    I have a 2003 GP800R. I purchased it this year and it only had 33 hours on it. For about the first 6 times I took it to the lake, it would run 65 mph according to the instrument cluster and do a 7500 rpm. Now it seem like it will run about 57 and 6500 rpm. I have changed the plugs and put in a new fuel filter. I checked the speed with a GPS and WOT it 50 mph. Any idea why it's not running like it did? It has 63 hours on it now. It is completly stock.

  2. #2
    start with a compression check and report back

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