My vote is for a carb adjustment and cable synch. These bikes will idle fairly smooth but with some side to side rocking motion. It's normal to have some vibration at 3200 RPM and 4000 RPM. But other than that, it should be very smooth.
Wanted: Dead, smashed, crashed or trashed gauges
BMW GAUGE REPAIRS - TACH*SPEEDO*CLOCK*VOLT METER *PODs & LIGHT BOARD*