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Spark plugs ???

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Moorey:
Denso or NGK  has anyone any preference, if so why.?

hairygit:
NGK every time for me, as long as they are genuine, a lot of "Fakes" out there now. Have used them since the early 80's when I bought a 750K2 that misfired constantly, in spite of being fitted with very expensive Champion A6G (gold tipped if I remember) After changing the points, condensors and coils/leads (bloody expensive!) and having the carbs apart several times, put a sey of NGK in, and it ran perfectly! Never suspected the plugs as they were brand new super duper Champions! Have used NGK on every vehicle since, and never had a plug fail.

Nurse Julie:

NGK. The nice Sales Director at NGK sent me a huge bag of nipples FOC when they started supplying them without and I moaned.(Even to this day the  pic on the box still shows a nipple !!!)

K2-K6:
There's an obvious double entendré going begging there Julie  :) must resist.

I've not often come across Denso plugs in use but when that's the case no problems encountered so no reason to say anything detrimental.

NGK have generally been more available over the years so most seem to use them. I can't even recall having one failed in normal service conditions, so 100% record in my experience.  As HG,  I run them in cars also,  again with zero issues. They'll easily run to 18,000mls in cars without any problems also. 

Seem exemplary in my view.

Moorey:
It would seem after digging there is nothing to pick between the two. Even the Honda parts books lists both makes. Its down to personal preference then.

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