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Message: [QUOTE="James Dean, post: 241630, member: 18501"] [b]Jetting Problems and Solutions[/b] - The KX250 has a rich needle stock, NAFF. The clip position is probably what you need to change. Move the needle clip position 1 step leaner at a time until the plug fouling stops. There is a "TECH TIP" bulletin out from Kawasai that suggests you use needle N3WE (P/N 16009-1915). I have measured both and can tell you it is mostly just 2 clip positions leaner. (NAFF#1 is nearly N3WE#3) James (You will see this in the Excel jetting spreadsheet and guide, see: [url]www.JDJetting.com[/url] , look at the examples for the types of graphs you can make to help with this on your own bikes.) [/QUOTE]