Yeah, with a bend at the top and angling down, that's an overflow tube.
For good measure, we all recommend that people run some carb cleaner in every few or every other tank of fuel. The carb is essential on this little bike so you have to keep it clean.
Reading what you wrote, I'm going to suggest that you inspect the valve clearances. Hard starting is a tell-tale sign that they're not in spec. The carb probably needs cleaning anyway, and could possibly be the overall issue - but I'm trusting my gut here. Check valce clearances
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