Just bought a 2007 CRF450X in great running condition. Put the street legal kit on and intend to use it to commute to work and back. It's about 20 miles there at 55mph. Am I going to have valve or tranny issues from driving on the highway. Also how often should I change my oil and air filter if I keep this schedule. Just read all the threads on valve problems on the "X" after I bought it of course and am kind of worried now.