If you keep a good synthetic motorcycle oil,A long time there are some people that have went 50,000 miles without doing it,The s40 isn't a bike that should be revved high rpms.

My cam chain tensioner was pretty far out when I got my bike with 9k mi. I got the verslavy modded tensioner from verslagen and didnt have to change out the cam chain and guides until 20k mi and I couldve gone longer. Check how far your tensioner is out then go ahead and get the verslavy either way. You'll use it eventually.

Wow! Been along time since I posted in here! Im one of the lucky ones I guess. I have 42,000 miles on my 02 and have ridden thru 17 states and most of my riding is at speeds of 60 mph and above. Lots of interstate riding at 70 and above. Gregg D changed my original cam chain at 33,000 miles and had me store it away cause he said it was still fine and could use again it if the new one went out on me. I like high speeds but I never wind up the motor in any gear. In fact, Ive never used first gear ever for that reason. I always start out in second. Maybe its not how many miles on the bike but how you treat your motor. By the way, Greg D is fine, but very busy with his motorcycle repair business. In the first year he had so much business he had to take down all of his advertising. Never even had the time to ride his bike once this summer