My very first VMX bike was a YZ 250 A , at one time I had three of them. I think I know a bit about them. I have only ridden the 250B and that was a short ride. It felt much heavier and more or less the same power. The Fork was better in action but still did not turn out of ruts. The rear was shit but that was probably set up. Once modified to race under the rules all I can see is left is extra weight.
Thank you for kind offer to ride your bike and when i make it to the west coast I love a few laps to change my mind.