I have an '84 Honda with some funky hoses too... at a glance it looked like it was just a carb or air box drain hose.. but the T makes it look like otherwise. On my carbs, there are some mysterious vent hoses which hook up to tees. These were very poorly drawn in all images that I could find in my service manual. I basically concluded that they were vents... I forgot exactly what for... but I decided they had a purpose when I was putting everything together... I guess the lesson is- check for connections at the carb(s).
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