I've got a GPR on my EC300 but since it came off a KTM I just filed out the head mount.
I would advise getting a damper with an adjuster near the bars so you can easily tune it if you stop for a couple of seconds. The WER will not allow you to do this.
PS on the 450's I noticed a friends around an enduro track was shaking it's head badly but this was because the suspension was so soft - it was also bottoming out with a clang quite a few times - maybe this is your problem also? a stock EC300 round the same track had no stability problems but the suspension was noticeably stiffer as well...
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'05 Gas Gas 300
'97 Aprilia Pegaso 650
'99 KTM 200
'95 ish XR630 (died many times in Oz)
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