Only basic suggestions:
Have you checked the air filter and made sure that a field mouse has not decided to make a nest in there? (no joke: it has happened!)
Have you done a compression check?
Does it sound like the bike is running on a single cylinder when it looses power? It could be that one cyclinder is not firing: an ignition coil one the way to failure, perhaps?
It is also worth checking the valve clearances, although this would be a constant, not intermittent problem... and I would also clean the carburretor internals, if I were you. You might have something blocking the main jets, or moisture in the reservoir, or a split diaphragm.
Good luck: I know how annoying these issues can be.
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Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)
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