As Tim said the Honda recommendations are for the belt to be replaced at 16,000 miles. Quite a few people have extended that to 20,000 miles and more with no reported problems. I usually replace at Hondas reconditioned 16,000 because I feel $125 and 45 minutes of work for 16,000 miles worry free riding is worth it. After all most people will get two to four years out of a belt. The 2007 I bought used only had 7,500 miles on it so that's almost eight years already and if you wanted to stick with Hondas recommendations that rider could have went 14 to 15 years if he trusted the rubber that long.