[stay_upright]

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...