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How to Replace the Spark Plugs on a Kawasaki Ninja

by Jared Curtis

There are two spark plugs on the Kawasaki Ninja, located in the engine, underneath the seat. The motorcycle's spark plugs provide a spark inside the cylinder wall of the engine. Worn out plugs will certainly cause misfire; overheating and poor fuel economy are also signs of worn spark plugs.

Remove the seat by pressing the release tab on the seat assembly with your hand.

Remove the two bolts securing the gas tank to the frame, located underneath the front of the seat toward the handlebars.

Remove each bolt on the side of the gas tank that attaches it to the fairing, using a ratchet and socket.

Slide the vacuum hose and fuel hose off the gas tank with pliers. Slide the tank out of the way.

Locate the two spark plug wires. Remove the spark plug wires one at a time to avoid confusion, by pulling on the spark plug wire boot. (The boot is the end of the spark plug wire that attaches to the spark plug.)

Remove the spark plug with a spark plug socket, by turning the wrench counterclockwise.

Apply a small amount of anti-seize lubricant to the threads of the replacement spark plug, and insert the plug into the spark plug well in the engine. Tighten the spark plug to 20 foot-lbs. with a torque wrench.

Apply a small amount of dielectric grease to the tip of the spark plug, and attach the boot of the spark plug wire onto the tip of the spark plug.

Repeat these steps with the opposite spark plug.

Replace the gas tank in the reverse order.

Items you will need

About the Author

Living in Utah, Jared Curtis graduated in 2005 with a Bachelor of Science degree from Utah Valley University in Orem, Utah. Curtis is continuing his education in hard sciences to apply to medical school in the future. He began writing professionally in 2010, specializing in cabinet-related articles.

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