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Posted on Sep 30, 2009
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Bike is only running on 3 cylinders but is ok when rpm above 3000

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Greg O'Day

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  • Expert 376 Answers
  • Posted on Oct 01, 2009
Greg O'Day
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Joined: Sep 17, 2009
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Carb needs cleaning and new filters put in.

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I suggest you check the exhaust pipe on each cylinder when you start the bike in the morning. My guess is that one cylinder is not firing properly. The "cold" pipe is the bad cylinder. If you haven't done it already, stick in a set of new spark plugs. I am surprised that the fuel injection system isn't sending sending the " FI "signal. Is the air cleaner clean? Good gas?
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Loss of power above 3000 rpm

You have a fuel delivery problem. Open the gas cap on the bike & try. This will prove if a vacuum is happening inside the tank (plugged vent). Check fuel filter. Check fuel pump. Check fuel pressure regulator.
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