My older brother bought a 2005 450r (kick start) new in late 2006. He rode it for one year (maybe 5 times) and then it sat. Since he doesn't want it, I want to get it running. It won't start though. It has some type of plastic screw thing on a line (maybe going to carb, not sure) that my wife was turning. Not sure what that did. What should I check/clean to do to get it running? Thanks guys.