Confused about sparkplug choices
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Confused about sparkplug choices
I'm in the process of restoring my old 1995 CBR 900rr thats been sitting for close to 10 years! Unfortunately, all I have found online is a '96 repair manual.
Sparkplug options :
NGK CR9EH-9 - regular plugs what the store recommended
NGK CR9EHIX-9 same as above but NGK's "iridium" model- sounds cool but not sure of it's benefits (if any). Seems too brittle to be gapped.
NGK CR9EK-9 - 2 electrodes instead of one
Sparkplug options :
NGK CR9EH-9 - regular plugs what the store recommended
NGK CR9EHIX-9 same as above but NGK's "iridium" model- sounds cool but not sure of it's benefits (if any). Seems too brittle to be gapped.
NGK CR9EK-9 - 2 electrodes instead of one
I used NGK CR9EH-9 previously on my 2000 929RR. I replaced them with the CR9EHIX-9. I am not going to say "i feel more power" because old plugs to new plugs is way different. BUT these plugs are non-gapable. You do not gap them, they come from the manufacturer gapped and they are not meant to be gapped inless you really kno what you're doing. I purchased mine from Advanced Auto for like $9 or $10 a plug. The Iridiums are only like $1.49 more and are designed to last longer and have a higher "flash point" (can't remember exact term). these plugs cross with Denso plugs IUH 27D, but those are $27.00 a plug. I have a post on here about plugs if you search for it, basically what I said above. I would recommend the Iridium (CR9EHIX-9) first then non iridium (EH's) and lastly the electrodes (EK's)(If i even have to recommend them). 
Last edited by Trey929RR; Sep 9, 2011 at 09:57 PM.
Nov 2011 ROTM
Joined: May 2010
Posts: 655
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From: O-Town
+1 for Iridiums. Been in there for years. They say not to gap them but you can and IMO should , you just have to use a quality tool and becareful around the Iridium tip. Thats what they are concerned about. My set def needed adjustment....at least if your an OCD perfectionist. 
Check out NGK.com - Spark Plug 411
Then click "+Spark Plug Questions: Iridium Plugs"
Then click on "Should I gap my Iridium plugs?"
It basically says do it at your on risk, "no warranty on snapped electrodes", only do if you are experienced.
"Your move Holy Man"
Then click "+Spark Plug Questions: Iridium Plugs"
Then click on "Should I gap my Iridium plugs?"
It basically says do it at your on risk, "no warranty on snapped electrodes", only do if you are experienced.
"Your move Holy Man"
^^^ Agreed. If you feel confident enough go at it... but what is it like $8 a plug. I would understand if they were $25 or $30 a plug like the Denso's, but for $8 I feel like it is worth replacing and pass on the gapping.
The OP also said " Iridium's seem to brittle to be gapped" so I was just letting him know what some distributors say, it can be done but only he knows his experience level.
The OP also said " Iridium's seem to brittle to be gapped" so I was just letting him know what some distributors say, it can be done but only he knows his experience level.
Nov 2011 ROTM
Joined: May 2010
Posts: 655
Likes: 0
From: O-Town
Yup , I'm with ya.
That electrodes are fine , its the tip thats tiny. No doubt you'd break it off if you slipped.
I'm a tad ocd like I said so the first thing I did was check the gap and all 4 were slightly different. Woulda been up all night telling myself I shoulda fix that while I had it all apart.
That electrodes are fine , its the tip thats tiny. No doubt you'd break it off if you slipped.
I'm a tad ocd like I said so the first thing I did was check the gap and all 4 were slightly different. Woulda been up all night telling myself I shoulda fix that while I had it all apart.
