Running roughly > new plugs > Result

[Oz1200]

(I wouldn’t normally post such a mundane thread, but I’m getting the UKGSer notice saying I haven’t posted in a while, so here I go…)

My 2005 1200 was running a bit roughly, and I suspected spark plugs. I’d been thinking about getting Iridium plugs, as I had had good results using them in my old Katana. The Katana didn’t feel different to ride, but the fuel economy improved a small, but measurable, amount.

I hit the net and decided that NGK Iridium DCPR8EIX plugs were the ones for me, and I phoned in an order to my supplier. When I arrived to pick them up he told me the wholesaler had decided I actually needed NGK IriMac 8 plugs. A quick read of the box indicated these would be OK. They certainly look like normal Iridium single electrode plugs.

(Here's a link: http://www.ngkspark.com.au/pages/bulletins/SB01-1.htm )

Anyway, I fitted the new plugs and my bike has been transformed. It is probably only back to where it was before one (or more) of the stock plugs started misbehaving, but that’s good enough for me.

Here’s what my internet research revealed (all from manufacturers’ websites, so should be credible), perhaps it will be useful to others:


Bosch (standard) YR5LDE
Denso (standard) XU24EPR-U
Denso Iridium IXU24
NGK Iridium (single electrode) DCPR8EIX
NGK Iridium (double electrode) DCPR8EKC
NGK IriMac 8 (not a lot on the net about these, but they work for me.) Stock number 3755

DCPR8EIX decoded

D 12mm thread
C 5/8 inch hex size
P Projected insulator
R Resister style (5k Ohm?)
8 Heat rating
E 19mm thread reach
IX High performance Iridium

YR5LDE decoded

Y Type of seat and thread - M12 x 1.25, 16mm hex size
R With suppression resistor
5 Heat range code number
L Thread length spark position – 19mm
D Electrode version (Dual by the look of the diagram)
E Nickel Yttrium

 

[Shrimpo]

Nice one

Geeza!

 

[Zigo]

Confusion

Found this on www.ngk.com:
"First lets address the IRI (WAY)(TOP)(MAC) series. These plugs have a .06mm Iridium center electrode with a tapered cut ground and are sold under the name Iriway, Iritop and Irimac throughout Japan and other select countries. In the USA and Europe these same plugs have been released under the IX iridium series and can be identified by there alphanumeric part #’s. The list below shows appropriate interchange. Both the IRI series and the IX series are produced in the same NGK factories in Japan. They are identical in construction; the only difference is packaging and marketing."

The IriMac 8 and the DCPR8EIX are the same plug

 

[Deleted account 211025001]

Useful info - cheers

Andres

 

[Oz1200]

Cheers Zigo, thanks for that, it is reassuring. And it explains all the Japanese writing on the box...

I guess Australia is a 'select' country in NGK's view.

 

[abrasion]

Fitted iridium plugs in my airhead.
Tickover dropped instantly by 500rpm and smoothed out.

Also fitted them int JustStans funduro , smoothed it out on tickover and acceleration.

Will be using them all the time in future.

 

[ghost-rider]

saft question, but when you fit these iridium plugs, do you need to "gap" em, or just chuck'em straight in???

 

[ghost-rider]

abrasion, just noticed your in the bromsgrove area, im only in halesowen so if you dont mind me askin, whered u get ur plugs from?????

 

[abrasion]

Got them off e-bay.

Best price and fast delivery.
To be honest i didnt even bother looking for a stockist local to me.

 

[ghost-rider]

nice one mate, cheers for that, ive seen em on ebay actually, i'll order em off there

 

[Oz1200]

saft question, but when you fit these iridium plugs, do you need to "gap" em, or just chuck'em straight in???

I didn't gap mine. All 4 were the same gap, slightly tighter than the recommended 0.8mm when new. I couldn’t find a suitable tool for expanding the gap, so left them as they were (if the gap had been too big I would have been able to do something about it). I think I read on the NGK website that the gap for Iridiums is not so critical – or I could be imagining that...

 

[D6]

used em for years, i discovered that my normal plugs on my bandit lasted 1 month, (it wasnt standard)iridiums lasted a year, i changed em after 14months an put em in my trike, still good, never even gapped em in all that time

 

[(RIP) ugg]

used a butt plug for years, i discovered that my normal plugs on my bandit lasted 1 month, (it wasnt standard)iridiums lasted a year, i changed em after 14months an put em with extra lube in my trike, still good, never even gapped em in all that time

owch..

 

[ghost-rider]

used butt plugs for years, bet it looks like the back of a baboon