I have a 2003 Speed Four.... I do my own yearly pre-season tune ups... one thing I have never done is a coolant change. I have never had any issues with the enginie temp or anything associated with that... I have about 7500 miles on the clock... should I change it out or am I good?? I have been working on bikes but my speed four is the first modern bike I have ever owned.. I have always worked on classics... any opinions or input would be great.... have a good one!!!!