Trying to be prepared . . . I bought two spare plugs for my WR450. I then was told by a WR426 owner that a standard plug sockect wouldn't fit all the way down into the head. My dealer gave me a plug socket that will probably work (thin walled) but then I got to the real problem. I can get the spark plug cap/coil to lift fully out of the head. It hits the frame before I get the needed clearance. Can that plug cap/coil be seperated into two pieces? Is there something simple I am missing here? What a poor design! Hopefully I won't need to replace a plug (especially on the trail) except a couple times a year for maintenance. I NEVER fouled a plug on my XR600s in over 12 years of riding them . . . but I always had a couple spares and the tools necessary to change it just in case!