That is one of the first issues I addressed when I acquired my SE back in 2007. I built an aluminium bracket that removed the connection between rad and tank and simply held in the rad against the frame in the lower brackets. Also removed the bracket to the oil tank altogether.
Even if you don't remove it, the rubber bushes holding the oil tank will give way after a few years and make impacts worse and worse, they were one of my normal check-ups during service.
I've beaten the crap out of that BD during many rallies and hard enduro sessions and trust it with my life!