Firstly, could anyone say if this kit does anything better then the stock settings: http://cgi.ebay.com/ebaymotors/New-DynoJet-Stage-1-Jet-Kit-for-Yamaha-YZ-450-F-07_W0QQitemZ230218448209QQcmdZViewItem?_trksid=p3286.m20.l1116 Secondly, could there be something wrong with my carb as my idle barely rises with cold start knob pulled out. The difference is no more then 100 RPM. It should rise to about 3000+ RPM, but it just sits around 2200-2300. With the knob out my idle is 2100 RPM. 48 pilot, 165 main, 1 - 3/4 on fuel screw. Altitude 0-700 ft and temperature about 60 F.