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How many spark plugs are there on a Kawasaki Ninja 650?

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There are two, you will need to remove the tank to reach them on top of the cylinder head cover.
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Where is the spark plug on a kawasaki ninja?

I'm guessing the same as most other bikes... under the gas tank.   take a look at this video   http://www.youtube.com/watch?v=Ct31s5JNhyM     The spark plugs are

How do you change the ninja 650 spark plugs?

Righty tighty, lefty loosy! Of course you have to get to them first under the gas tank. Should be able to without completely removing the seat. Prop the tank up with a couple