OK so this topic may be beat to death but the search function is such a pain and I did try. Anyhow, on my '00 WR400 I've noticed that if I twist the throttle real fast from idle it will bog down and sometimes die. Now if I let it build RPM just a little before I open it up it does not do this. The carb is in stock form, and I have a WB e-series slipon silencer with 12 plates. Like I said as long as I get it going just a little before I hammer it there is no problems, and it will run like a rapped ape. I just wonder if it shouuld be bogging down like it does and if not how much better would it run if that were tuned so that would not happen?