Just picked up a 2003 DRZ250 for my son. It has a full Yosh system on it and seems to run OK. It doesnt rev very fast though and is really rough at low rpms. What are the basic mods and jetting recommendations for this thing? I know I did some basic mods and jetting to my DRZ400 and the thing woke up in a big way. Is there a better carb that is inexpensive that will help the 250 out? I will be searching the archives but they are...well archives and maybe old info... Any info appreciated!