Hi, well definatly not the cam cahin as your Enfield doesn't have one, most likely Piston slap, very common on Enfields, especially "Indian" market models as these are not as well made as the export ones. If it is piston slap I wouldn't worry about it. If it is the big end, will "knock" under load and vibration will be apparent, that will be more vibration than usual, after riding from India I guess you know what the normal vibs are like. The knock will get worse and will not dissapear once the engine is warm, in fact as the engine warms up and the oil "thins" out the noise might get louder. I have rebuilt lots of Enfields as I used to work for an Enfield dealer in the UK. Hope this helps
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