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

 

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).

 

Thanks I'll give the iridium ones a try.

 

Iridium's r fine for ur blade, will last a bit longer too!

 

+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"

 

Of course "at your own risk" but if you can't gap a set of plugs without screwing them up....

IDK

Just saying......

 

^^^ 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.

 

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.

 

I ran the standard CR9EH-9 plugs in my 99 and never had a problem, They seem to work great. Even with the jetting and full exh and K&N