Thread size of a spark plug

[nutbox]

Hi there ,
I was wondering if someone could tell me what size the thread is on a spark plug on a 2.0l cu engine .
I am thinking 14mm x 1.25 is this correct.
Thanks dazz

[kevtherev]

there are four standard spark plug threads, all metric: M18 x 1.5; M14 x 1.25; M12 x 1.25; and M10 x 1.0

[nutbox]

Thanks Kev I think it got to be the 14mm ,I'm asking because I have gone and cross thread the plug on number 3 so was going to try one of these back tapers.
Cheers dazz