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When are you seeing wet plugs? Does it light with match? If so, you've got way, way too much petrol, like 50x too much. Wet petrol does not burn! My high-school shop teacher did scary demonstration of throwing lit match into bucket of liquid petrol, it went >pft< and went out. Petrol must be vapourised with lots of air in order to burn.
From info you've given, logic would go as follows:
1. bike runs, good, have petrol
2. bike stops, not good. why?
3. put rag with petrol in airbox
4. bike runs.
Conclusion#1 - without #3 (rag w/petrol), bike receives no petrol and does not run
Conclusion#2 - carbs are not factory-clean
Conclusion#3 - to get carbs back to factory-clean fresh, needs to be serviced by someone that can genuinely clean carbs back to factory-fresh condition. Someone with experience of cleaning 100s of carbs, who has specialized equipment with giant selection of scrub brushes and wire picks and wire flosses, and most importantly, knows which tool to use when and where. Someone with ultrasonic cleaner using exact radioactive caustic solvents needed to clean dried petrol varnish (plastic). Someone with micro soda-blaster to thoroughly clean hidden internal passages in carb-bodies. Not very likely any motorcycle shop would have such person on staff.
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