Chain luber
 

How often to lube? As often as the chain appears dry. But how to do this in the rain or dry and dusty? Simple, just find a oil injector tank off a old japanese two stroke. Attatch it to the rear rack and insert a small valve in line and positon the end of the line in front of the rear sproket and lower chain interface. Fill the tank with anything from gear oil to chainsaw bar oil to used engine oil. Adjust the valve to a slow drip that will lube and clean your chain and ride. Yes the back of your bike will get oily but your chain and sprokets will live.