My 87' FXLR has an S&S carb with the vent tube routed below the engine with a small breather/filter on the end. My question is that when the bike has not run for a long time, say about six weeks, it pukes a lot of oil out the vent. The previous owner did this set up and I know that it should be vented up to the air cleaner. Is this done to prevent fouling the air filter with oil? It doesnt appaer to have much blow by or use much oil when run on regular basis.