my list of firsts things to check
are you sure you topped it out?
1.pull the plug out, if it was running rich for some reason, it should be very blackish, post photo.
2.get a new plug (which you should have on a long trip...) and see you have good spark.
3.Check that the choke is not stuck in ON position. That could make the bike use a lot of gas and eventually foul the plug too.
4. Take out the carburetor float bowl draining screw, open the tap and collect the gas in a container, check if there is water collecting at the bottom, not good if there is.... then see that you get a good steady flow of fuel coming out. if not, you might have a clogged filter or maybe no air is coming into the gas tank through the cap, but in that case bike would not consume much.
check these and come back to us, well dig deeper
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