Right sparkplugs? Platinium or Iridium?

[Maintenanceman 206]

Time to change plugs.

Only thing is that, in service info that Finish importer gives, right plugs are NGK CR8EHVX-9, these are Platinium`s

In NGK info, they are listing option plugs, CR8EHIX-9 and these are Iridium plugs.

So, which is better? Standard Platinium or Iridium?

And then, that number what indicates "heat range", BB plugs are 9`s, is there any reason why i cant use them, we have one set that i could use for free And these are Iridium`s

CR9EHIX-9

Edited June 7, 2010 by Maintenanceman

[x11r 388]

Use them , it shouldnt be a big diference , check out this chart. 9 is for slightly cooler.

http://www.ngk.com/glossaryImage.asp?imgID=721

Edited June 7, 2010 by x11r

[Guest standish honda]

I have used both with no real difference, currently have iridium as they were cheaper to buy at the time.All those claims about better performance and better fuel economy BULLS**t.

[Guest fe5ta]

I have Iridium plugs and also found no difference, maybe they last longer than standard plugs

[Maintenanceman 206]

My fuel economy depends of my throttle hand, nothing to do with plugs

Will put those "9" iridiums, on many bikes service infos, there is option for hard driving, for example

normal driving "grade8" and for harder driving "grade9". And sometimes for cold weather "grade7"

[Guest raeman]

I have NGK Iridium CR8EHIX-9 in mine.

According to the Haynes Blackbird manual, for FI bikes they need changing at 32,000 miles and checking at 16,000.

I got my bike when it had covered 7.5k so when i serviced it, i changed the plugs aswell not knowing they lasted so long!

[XXIIStu 2]

Hey fellas, and girls 

My X11 was garaged for about 9 months and I finally got round to getting it back into use.

MOT'd with no issues at all. 

Now I've been riding round a bit I found that when moving along on "neutral throttle" keeping a consistent speed it seems to run a bit "lumpy", although it's fine while accelerating. It's not serious but is annoying, I thought the spark plugs were playing up so bought a new set. I've just got round to swapping them and found that the "old" ones look like they're in good shape, any thoughts????

[blueboy 139]

Guess the thing to do is ride it and see if problem has gone. It could be that 1 of the old plugs has started to break down and may not be visible.