[Darren69]

My aftermarket yoke set runs a shim in the bottom yoke with the standard S4 forks. That gives the option of running larger forks (Ohlins) if required. No problems with doing so, as it is much stronger and better metal that the standard one anyway. I would be more concerned regarding removing material from the original castings it may weaken them and as they are brittle it could crack, although plenty have done that mod so it should be ok.