So what suspension does it have? Is it adjustable in anyway? This would point to it being either an SE or R model.

As for the "little round gizmo on the front underside of the airbox" you may well be referring to the petrol overflow pipe. The top of the airbox has a square 'receptacle'. This has a drain formed into the bottom. The drain should then connect to a hose that works it's way out next to the rear sets. Check the bottom of the petrol tank....you'll see a little overflow pipe that lines up.