If your taking weapons for Display purposes only then all "old spec" deactivated weapons are ok, the new EU rules do not stop you owning or displaying them. Selling/Exchanging etc is where the problems may start.
I occasionally get a violent shudder through the body at those speeds but feel nothing through the steering it only lasts a few seconds then stops. I have never been able to find the problem either.
Dont know if any ones interested but just upgraded my GPW to electronic ingnition so easy to do only took 10mins and didn't have to adjust timing, just started and ran fine work on 6 or 12 volt. Once you fit rotor arm and cap you can hardly see a difference.
Got them from www.simonbbc.com £39.99