It seems that in Unity 4.3 you can't set the mass of a Rigidbody2D at runtime - it just reverts to it's original value. I've tested this and also found a [forum thread][1] quoting the same problem.. wondering if anyone has found a work around for this or knows whether it will get fixed any time soon?
[1]: http://forum.unity3d.com/threads/210978-Cannot-change-mass-in-Rigidbody2D-v4-3
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