Today I bought an 05' Grizz, my Yamaha dealer told me to bring it back after 4 or 5 gas tanks full for it's first maintanance, has anyone heard of a more accurate way to judge when it needs it's first maintanance? Also how hard can I ride before the first maintanance? I got too excited today and rode kind of hard, oops. Rob this site rules by the way. How long will a full tank of gas generally last? Is there anything that I really need to know or do to my Grizz? Thanks in advance.