Why when you do long ride with your gsr 2000 you have cut off at 5000 rpm .. at beginning cut off a 8200 at usual?

The fuel pressure could be dropping as the engine runs for a while. It could be as simple as a fuel filter that gets blocked as you drive, or it could be the fuel pump pickup screen inside the fuel tank or even the fuel pump that starts to fail when it gets warm. There are plenty of other possibi...

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