Changing plugs on these bikes is one of my least favourite jobs. I then remembered from my days in the motor trade, some time in the early nineties Iridium plugs were finding their way in cars. 50,000 miles between changes instead of 6,000. And a possible small gain in performance.I couldn't resist so bought a pair. First thing i noticed was the absence of bullet terminals, instead, just a M4 stud. Tried removing terminals from old plug, but ended up destroying it. So fitted new plugs anyway with just the stud. Everything worked, but thought performance was down. Managed to find seperate terminals on flea bay, and fitted these. All seems well. Does anyone have any experience with these, are they worth the (considerable) extra cost? The ones I fitted were NGK DR8 E IX. which I was told is the direct replacement.