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Welcome to the forum.
+1 on the scottoiler pipe... clearly without the oiler!
Bike will not run well as that will be a vacuum pipe that is now open to the air.
It will come from a tap off from the throttle body. A small screw will have been removed and replaced with a vent adapter (same as if you were performing a carb balance).
Take adapter out and replace with screw or cut pipe close to throttle body and clamp the end to seal it.
Not sure I have describe the terminology correctly, but hopefully you will get the drift!