Aihead bean can: Lubricating the timing weights.

My Beemer has been running a bit irregular at idle lately. It would usually idle too high (1300-1500 rpm), which after a while would drop to rpm's as low as 800.  A short google search revealed that sticky timing weights might be the problem.The part responsible for the timing on an airhead sits behind the front engine cover:You see why the call it the 'Bean Can':The bean can has a little hatch