Nah.... bike works exactly the same. No difference.I wonder how much more the fans have to fire up when you fit these as you are effectively halving the surface area of the cooling fins.
I had two small holes in my rad due to following my mates at high speed on the Shap road.
Drained the rad and patched the holes with epoxy resin. Worked brilliantly. Banged a r+g rad guard on as soon as.