I depends on where you are reading the plug, and how you are riding the bike. Lugging it and cruising around town may not clean them off properly. If this is the case, then you should run a hotter plug, but switch back to a cooler plug for WOT riding.

PLEASE LOOK AT THIS PAGE, AND SAVE THE SMALL PICTURE FOR YOUR OWN PERSONAL USE:

http://www.tsrsoftware.com/sparkplug.htm

Dry clutches make the MOST noise when they are disengaged, and have a small ring/tinny sound when engaged.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS