My WR426 is not running clean when I have the throttle wide open. It kind of blurbs. It also has a spot a little higher than idle when it does the same thing. Has anyone else had these problems and if so, what did you do to fix it? I only just bought the bike and as far as I know, the only mod is a Staintune exhaust. Also, am I supposed to check the oil when the bike is hot? Thanks in advance.