I seem to remember a previous bike's plug seal thingy was just an interference fit over the lead. I don't know about the Fazer though. They're just rubber so give one a tweak and see if you can pull it side to side and find a gap.
By the by, anyone any idea how long spark plugs on the Gen 1 are supposed to last? I have to admit, I just changed mine after 40,000 miles because they never gave any trouble and when I whipped them out this afternoon they were still perfectly serviceable. I replaced them anyway because they were showing signs of corrosion just below the ceramic, but the tips were fine.
Now, if only the flipping EXUP valve went so many miles with so little attention.
