Kawasaki Ninja Service Manual: Separator Operation Test

• Connect the hoses to the separator, and install the separator on the motorcycle.
• Disconnect the breather hose from the separator, and inject about 20 mL (0.68 US oz.) of gasoline [A] into the separator [B] through the hose fitting.
• Disconnect the fuel return hose [C] from the fuel tank [D].
• Run the open end of the return hose into the container and hold it level with the tank top [E].
• Start the engine, and let it idle.

If the gasoline in the separator comes out of the hose, the separator works well. If it does not, replace the separator with a new one.