HAve a 2004 Roadking, and have noticed oil transferring into primary. What should I be looking for that may cause this problem. I have worked on many Evos that have done this and it was either the case race or the oil seal. Never worked on a twin cam with this problem. Thanks

 

The design of Evo and TC are similar in that area, so the same suspects are in the frame! I must admit that I haven't heard of TCs doing it, but that doesn't mean they aren't.