I never got a chance to see if ESR plate on my bro-inlaws bike has any advance built in.I guess I'll take that risk of kickback if I can get a little more performance. Just not sure how much to move it. Maybe just move it halfway and test it.
I have heard by some that it does and others that it does not.
I believe it does not and if you advnce it all the way you probably get 4-5 degrees without making the slots longer.
On my cr500 w/2000 cr250 stator I have been able to slot it enough to get 8 degrees of advance
On CR motors the clutch arm pushes against the side of the stator where the piece of metal on the right side is. If I advance any more than the arm will push out when pulling in the clutch.
TRX motors don't need this arm stop so you can advance farther.