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Ducs without O2 sensors will likely run a bit richer at small throttle openings, but IMO that's a good thing, as they're usually kinda lean from the factory.
From what I remember, it didn't really make much difference on my bike, but it was quite a while ago when I took the evap off.

Those with operational O2 sensors will likely correct for it when the ECU is running closed-loop.
 

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I haven't closely inspected one of the plastic-tanked bikes, but ...

There are 2 hoses from the tank, one is the vent to the inside of the tank, and the other is the drain for the filler recess.
Neither should be plugged.
 
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