[El Duca]

If anybody is using NGK CR9EK plugs, maybe you should see this site & read the last part of the two free horsepower article. I think it applies to the R1 as well as the R6
www.mototuneusa.com/two_free_horsepower.htm
I'm not taking the risk!

 

[JAYSTENSEC4CYL]

CR9EK

17,500 miles on my 00 R1 and no problems with the CR9EK's I installed at the first service.

 

[El Duca]

JAYSTENSEC4CYL,
Did you visit the site? The guy said the plugs are great. The problem is, the plug is longer than standard & has 2 threads protruding into the combustion chamber. Carbon deposits accumulate on the thread & when you take the plugs out, its going to strip the thread in your cylinder head!!!!!!!!!!!!!!
The only remedy according to this guy, is to change the plugs very frequently before carbon builds up.
If you dont believe it, there are photos on the site showing what he's talking about.
Good luck!

 

[JAYSTENSEC4CYL]

MOTOMAN

I have been to his site and read his articles. I have changed plugs three times in 17,500 miles and no problems. I have always run CR9EK's, even when I had my 95 and 97 ZX6-R. I think they resist fouling better.

 

[El Duca]

JAYSTENSEC4CYL
But according to the photos, there IS a very strong possibility of ruining the the threads unless those photos are fakes.
Or is that guy just nuts????

 

[JAYSTENSEC4CYL]

ALL I KNOW IS

I have never had a problem with getting them out, even after several thousand miles. If your worried about it try using anti-seize and remove them every 2 or 3 thousand miles to keep the threads clean. Me I just ride and don't worry about it.

 

[Smoken Joe]

Maby you should make sure you mixture is not not way off and you may not have that problem.

 

[El Duca]

I'll just keep my Denso Iridium IU 27s & sleep in peace