It is now my official stance that the Royal Enfield brand has the worst wiring in motorcycledom. The sole reason I am selling mine. Worse quality than Lucas on a bad day.
In addition to losing my starter selenoid and losing my delay box, I also had another problem that you may be experiencing. My neutral safety switch, located under the clutch lever and secured by two screws, went open-circuit on me and fed 12 volts through my ground. No ground, no start. Check it with a multi-meter. Symptoms were, sometimes would crank the ES with the clutch lever pulled in, sometimes not. And sometimes not at all, regardless.
Yet another problem is located within the wire harness, right about under the seat. You have to slice open the harness to get to it. There is a junction where 3 ground wires meet. All those wires are as thick as a human hair and meet a tiny junction secured with a drop of solder. Yup, you guessed it. it broke. Had to find it and put a proper solder connection on it, re-tape the harness back toghether.
One good thing about this bike. Its turning me into an electrical pro overnight. Neither may be your problem, but if all else fails, check those two things.
Minda of India is the new Lucas.