I did this trip a few years ago and it was by far the most dangerous ride I have ever been on. Would I do it again , no , am I happy I did it yes, it was a life changing trip.
I did it on an Enfield 500 kick start with a number of other terrified riders over 4 weeks. India is amazing, all you have to do is leave your western values behind and just accept what you experience and see.
Its not for the faint hearted, but for pure adrenaline and adventure it would be hard to beat.