I'm way ahead of you thumpalot, I completely took my carb apart and cleaned it out. It was spotless before I even did that. I inspected everything and it looked great but I figured since it was apart that I would hose it down in carb cleaner and blow it out with my compressor. Anyways that did nothing.
I'm gonna try a richer pilot. If my valves are out of adjustment will that have anything to do with throttle response off the bottom.
All I can say right now is that I feel absolutely no effect from boyssen's pump cover. I'm sure its not there product, but all my fault for not having the bike tuned right.
What about needle height? Anyways I'm gonna check my valves, if there good then I will try a richer pilot. If that does nothin then I will move the needle. If no luck there then I will get a YZ250
you are giving up too easy.........did you make sure that you installed the diaphram right side up - a common mistake. Set the AP duration with the gauge it is the starting point - stock level
The fuel screw should be set 1/4-1 turn out -
Valves have nothing to do with this - but check them for adjustment