Thanks to all for your replies.
Well i got a little paranoid about the piston and rings and bore being damaged so we looked at that 2 days ago . Thankfully all was ok so the filters and magnetics did do their job.
I have decided to try a local repair job. The mechanic here is confident that he can get the camshaft "skimmed" through a lathe and get the chip/chunk that was taken out of the exhaust rocker arm soldered. Most of the bearings can be bought locally. The one bearing that needs machining is the cam follower bearing. Yesterday we found some suitable material for the new bearing. I guess if there is anywhere in the world where they are good at rebuilding engines it is here in Peru.
So its a cheap and quick fix. I will have to wait and see how good it holds up. I have around 10,000 or 15,000km left in my trip.
As for being stuck in Cusco, well its great spot to be stuck. Plenty to do and see nearby and lots of good people about. Highly recommened as a place to be stranded!!
Thanks,
Eamon
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