Regrettably, this is a common problem. The EPA requires that air vented from the crankcase be circulated through the engine to be burned. Since a Harley engine is a V-Twin engine with a single crankpin, the crankcase pressure is quite high with both of those pistons going downward at the same time. That is why Harley moved the crankcase vents to the heads in 1993. This helps but there is still some oil mist in the vented air and it will accumulate over time. This requires that you periodically clean the air filter cover out to keep most of the oil build up from dripping out. If the oil blowby is too bad, you may need to consider having a leak down test run on the engine to check the condition of the rings. Also, there are some "umbrella seals" in the rocker box covers that may need to be replaced.
Good Luck
Steve
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