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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.

Step 1

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

Step 2

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

Step 3

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

Step 4

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

Step 5

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.)

Step 6

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

Step 7

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.

Step 8

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.

Step 9

Repeat these steps with the opposite spark plug.

Replace the gas tank in the reverse order.

Items you will need

  • Ratchet
  • Socket set
  • Pliers
  • Spark plug socket
  • Anti-seize lubricant
  • Torque wrench
  • Dielectric grease

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