My understanding was that the BK2 rear end brought the motor forward a little resulting in a shorter car. This meant it had a little less forward traction as the front/rear weight balance changed. I think this meant it had less stability but pretty much the same pendular effect and didn't work so well.
Maybe now, as brushless motors are heavier than brushed, it might be worth trying it again?
Just a thought, as I have never run one. Hopefully someone a little better at the whole racing thing than me can say something a little more detailed
Ben
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