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#4: This was installed in a flying RV as an oil breather hose. What's wrong with this picture? (answer below)
1. It's automotive hose (not aircraft) choked down to another automotive hose. Not only the wrong hoses, but...
2. the clamp was so tight that air/oil flow was reduced to almost nothing.
Replace with Mil 6000 hose (one accepted solution) of the same inside diameter as the fitting on the engine. Also, some foks use a combination of Mil 6000 hose and aluminum tubing. You can order Mil 6000 hose from Van's (www.vansaircraft.com/cgi-bin/webstore.cgi) and several other sources. Google 'Mil 6000 Hose'.