Bigdog wrote: This line is supposed to vent the vapors inside the crankcase into the air cleaner where they enter the combustion air flow. This tube often becomes clogged and can no longer vent. You can loosen the fittings to remove and clean the line. If there is not a lot of smoke, I'd clean the tube and not worry about it.
took the tube off because I too was experiencing a bit of vapors at the oil breather cap and the tube is in fact quite clogged. to the point that I can't unclog it! tried 90 psi of air, degreaser, carb cleaner, kerosene, along with a piece of 12 gauge wire to break it loose, but no luck. it's soaking now with kerosene in it and I'll work it some more in the a.m. gonna take a torch to it as a last resort, avoiding the brass fittings and over heating the steel too of course.
You can soak your air cleaner,oil cup and dip stick in a big tub of KROIL or parts cleaner and then blow dry with your air compressor 
