I was just wondering what some of you guys are running as far as main jetting ,etc.I have a 1998 Sport 400 with tm38 mikuni,RCR hi-rev pipe and silencer,port +polish,coolhead w/43cc dome,kn filter on carb.I am currently running a 600 main jet,haven't had a whole lot of time to mess with it lately.I have no doubt this is rich,will have more time this coming weekend.Thanks for any help,Marvin[img]i/expressions/face-icon-small-happy.gif[/img]