Well, I really didn't do anything to my Royal Enfield but ride it but, I did buy myself a new helmet.
I've been wearing a HJC CL-16 ever since I bought my RE G5 in 2011 and I considered it as the best helmet I've ever worn (and that includes Bell and Arai).
Anyway, I bought a new CL-17.
I only rode with it on for about 6 miles but it seems to be even better than the -16.
Especially the air vent they added to cool off my forehead. It really works making a noticeable blast of air.
I guess now that I have a new helmet, I'll have to buy a new 650 Interceptor if they ever get around to importing them here.