Yet another "clean up junk which shouldn't been on this bike in the first
place" -- Nichols engine breather will stop the oily mess that collects on
the rear of the engine. Its reed-valve is made from thermo-plastic which
will breath more easily and last longer than any knockoffs made of carbon
fiber, etc. This is also the only product of its kind which comes with
a spanner wrench and takes only minutes to install. I'm very happy with
this assembly since it significantly improves the breathing and return of
the oil back to the engine's crankcase.