2004 TTR125 with the same issues as most people, cold-blooded, hard starting, won't idle, etc. So I read the forums and step by step worked my way towards a solution and this is what finally worked for me. A jet kit from Procycle - use the #110 main and the #20 pilot. Three turns out on the pilot air/fuel screw. Cut the top out of the airbox. Cold starting twist the throttle a couple of times before you kick, leave the choke on for a few seconds after it fires up. Totally different bike now. Starts with one kick, idles and throttle response is crisp. Thanks to everyone who posted good information here and I hope my setup will help someone else.
