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I took out the spark plug on the fourth cylinder and it appeared to have some metal on its thread I cleaned it out and put it back inside while tightening it the thread broke inside

enter image description here

The part in circle is what broke off, although the tip which is not connected to the threads is still there.

Now how do I deal with this problem? Do I have to take off the head and remove the bits and remove the plug?

  • Can you add a photo of the damaged plug? – dlu Oct 12 '16 at 23:38
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Alright I managed to remove it using a screw driver and hammering on it, I know this could have broken the threads inside but luckily it didn't. I used penetrating fluid to help loosen it a bit more. The engine was sputtering after installing the new spark plug because I add a little bit excess of penetrating fluid but after it cleared up it ran fine.

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    Right on, glad you got it out. +1 for success – DucatiKiller Oct 13 '16 at 3:21

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