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Old 01-17-2014, 09:06 AM   #9
renogeorge
Beastly Adventurer
 
Joined: Apr 2007
Location: Reno
Oddometer: 1,256
I haven't noticed any performance difference with the iridium. Guess they last longer but I usually change 'em after 20k miles or so. There is 1 NGK iridium which has a fixed/permanent end/terminal cap. It does NOT unscrew. So be sure you get the right plug for your spark plug/coil end. I've owned 950s and a 990 and don't remember on which bike I had the problem or the plug #.
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KTMs--300, 518, 990
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