Per the owner's manual and the service manual the Clutch Shoe Wear Inspection interval is every 4,000mi (6,400km). I don't hold too fast to this interval, but am generally close. I'm not as fastidious (anal/OCD) as some.
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Dale
Huntsville, AL
2 x 2005 - Hers & His
Boots, socks, underwear, pants, t-shirt, jacket, gloves, & helmet.
http://www.youtube.com/user/jdeereanton
Riding on "Just Basic Shocks" - My shocks, while completely functional, have never even been nominated for an award.