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 Post subject: NGK CR9EHIX-9 Iridium x4
PostPosted: Sun Apr 02, 2017 2:56 pm 
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Moto GP Rider
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Location: N Cambs UK
Set of 4 NGK CR9EHIX-9 Iridium plugs. Used for 90 miles. Not specified for a 9R but various Hondas including CBR600, Fireblade and Blackbird

A Fiver to me for postage and a suitable donation to the Forum. PM if interested

Fitted by a local bike shop that I will NOT be using again. They also managed to get one of the ram air vents mis-aligned to the fairing intake. I would've been none the wiser for a while if I hadn't assumed they'd fitted regular plugs and went to change them

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PostPosted: Sun Apr 02, 2017 6:09 pm 
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BSB Rider
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Location: whittlesey cambs
just out of interest what local bike shop was that?!.


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PostPosted: Sun Apr 02, 2017 8:07 pm 
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Moto GP Rider
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Relax, they're not in Whittlesey or Peterborough. I might be forced to use them again so I'm keeping schtum

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PostPosted: Sun Apr 02, 2017 11:03 pm 
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BSB Rider
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Location: whittlesey cambs
Cool!.
I tend to use a couple in Peterborough, with the motorcycle works being my favourite!!


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PostPosted: Mon Apr 03, 2017 12:37 am 
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WSB Rider
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So what's your problem with the plugs? They are a spec replacement for the oem cr9ek, and I've used them in my E for a couple years with no trouble.

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PostPosted: Mon Apr 03, 2017 9:56 am 
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Moto GP Rider
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Location: N Cambs UK
The NGK UK Part Finder web page
http://www.ngkpartfinder.co.uk/mc_searc ... engine=900

and the NGK motorcycle catalogue PDF (Page 41)
http://ngkntk.co.uk/wp-content/uploads/ ... at2016.pdf

both only state CR9EIX/CR9EK. With a very similar part no I thought they would be close but with no definitive info I erred on the side of caution.

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PostPosted: Mon Apr 03, 2017 10:23 am 
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Moto GP Rider
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Having had another read through the PDF catalogue (Fitting the Correct Plug section) and looking at a few ebay listings I found the difference.

CR9EIX have a full 19mm length of thread into the head.
CR9EHIX-9 have only 12.7 mm thread and 6.3mm unthreaded

Fitting the EH will put the spark in the wrong place, lower compression and choke the lower part of the thread with combustion debris (real fun at next plug change)

Time to see if I have an old IX plug and pay the shop a visit

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PostPosted: Tue Apr 04, 2017 12:42 am 
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WSB Rider
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Location: Nova Scotia. 2000 E1
ypvs wrote:
Having had another read through the PDF catalogue (Fitting the Correct Plug section) and looking at a few ebay listings I found the difference.

CR9EIX have a full 19mm length of thread into the head.
CR9EHIX-9 have only 12.7 mm thread and 6.3mm unthreaded

Fitting the EH will put the spark in the wrong place, lower compression and choke the lower part of the thread with combustion debris (real fun at next plug change)

Time to see if I have an old IX plug and pay the shop a visit


Guess I stand corrected. Did you notice the plugs were wrong because the bike wasn't working right? I can't imagine you'd be getting good combustion with the electrode more than 6mm up inside the spark plug hole...

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PostPosted: Tue Apr 04, 2017 10:50 am 
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Moto GP Rider
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It only felt just a little off and the idle was a bit lumpy- hence why I thought regular plugs

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PostPosted: Tue Apr 04, 2017 2:48 pm 
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Ninja Guru
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Don't know folks' problem with regular plugs :-?


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PostPosted: Tue Apr 04, 2017 10:44 pm 
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WSB Rider
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Location: Nova Scotia. 2000 E1
FatherDougal wrote:
Don't know folks' problem with regular plugs :-?


My problem is that you can only get them at a dealership around here, and they charge twice or more what iridiums cost at the local hardware/autoparts stores.

Picked up iridiums on sale for $8.00 a pop vs $18-22 for CR9Eks at the local dealerships.

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PostPosted: Wed Apr 05, 2017 12:41 am 
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Moto GP Rider
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FatherDougal wrote:
Don't know folks' problem with regular plugs :-?


Quicker warm up and choke off, more low end and engine pick-up. Difficult to tell if any top-end gain with seat-of-the-pants testing. Then again if I've paid more for them then I'm going to say they're better ;)

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PostPosted: Wed Apr 05, 2017 10:51 am 
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Moto GP Rider
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Nob eds dealer.....
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PostPosted: Wed Apr 05, 2017 6:26 pm 
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Sure the ones I use don't have the H in the letters

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