These guys are right...if you have the time to do it, why risk not doing it? If you don't have the time to fix it right away, it's ok, but I would get on it as soon as you do have the time. I bought my 05 with 2800 miles, waited until till about 5500 miles and I changed the doo and found a broken tensioner spring that attaches to the doohickey. Wasn't causing any problems, but the bike ran a heck of a lot smoother when I replaced it. Even an average wrench can handle changing it out in less than 2 hours. I'm a novice, and it took me less than an hour, but I had alot of help!