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Oil coming out oil breather

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I have a 2005 crf 450. The last couple of rides I notice a small amount of oil on the swing arm. I finally tracked it down to the oil breather that goes into the air box. This breather connects to the valve cover. What is causing this issue? I just changed my oil 700cc in the engine and 700cc in the trans.

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check your oil levels to see how much your loosing from your trans, and double check your engine side isn't overfilled now. If it is, do a "search" for "oil migration" or "crank seal"..

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The valves and piston have about 30hrs on it. Are you suggesting a bottom end rebuild?

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