What kind of motor oil do you put into a Harley Sportster 1200 Custom?

The Factory will usually put in and Recommend Harleys own 20W50 which is actually produced by Citgo. After 500-1,000 Mile Break In .. I recommend switching to a Synthetic such as Amsoil, Mobil 1, or Redline. I have been using Amsoil Motorcycle 20W50 Synthetic on my 2004 Sportster for 3 years now on Both Engine and Primary/Tranny Applications with great results...