Gasoline is extremely flammable and can be explosive under certain conditions. Turn the ignition switch OFF. Do not smoke. Make sure the area is well-ventilated and free from any source of flame or sparks; this includes any appliance with a pilot light.
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.
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Test yourself
A quick Kawasaki Ninja ZX-10R quiz: every answer comes with an explanation and a link to the manual page.