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I would carry a can of starting fluid or such. Then when it quits it should try to run on the canned fuel "if" it is a fuel issue. Just get a can with the small tube on sprayer and spray into filter.
Then if it doesn't try to start or run on the fuel you can rule out the fuel issue.
I would bet on the coil going out. Have seen a few do that as in stop working once it gets hot.
Could also carry a spark plug that you have tested and shows good spark with your bike turning over.
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