Hey, moved the 15 tooth to a 14 tooth on my DRZ400S tonight and just wanted to comment that the nut was in fact terrifyingly loose, and any new owners (such as myself) should definitely heed the loctite warning. The nut itself came off with a little bit of applied pressure and a handheld wrench. No impact gun, no breaker bar, no holding the rear brake. Additionally, if any of you are curious the 14 tooth sprocket actually comes in handy from what I can tell so far. It makes 3rd a useable around town cruising gear (it was pretty luggy for me originally and I would often have to swap between 2nd and 3rd riding through town). Oh also it makes the front end jump up pretty quick, if thats what youre looking for. While Im at it, I set my chain sag with the kickstand down and the bike on the floor @ 1.5-2 inches like I read elsewhere on the forum, is this normal for the rest of you?