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               Originally Posted by 
              Gas_Up_Lets_Go  
              There are plenty of post on the forum about it, some people don't care, some are looking to fit super dooper air-lock-thingamawatsists so when they next ride into a 5 foot puddle it doesn't back fill into the crank.
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         I fall into both camps 
        
 
         
         I drain the tube when I change the oil, it doesn't spit enough through the breather between services to change the oil level significantly. So I don't care.
         
        
 I am concerned about filling my crankcases with muddy water. At least concerned enough that spending a few quid on a couple of metres of hose seems like a good investment.