"it's a harley, it's supposed to leak"
Those are usually just a checkball needing replacement. I hate it, it doesn't take much to replace the checkball. The old total evac motors were the only ones designed to leak, the fat bobs(going from a lot of memory now since I haven't worked on one in over 25years) were actually designed as one half being gas and the other half being oil. They would empty out at about the same pace due to how they pumped according to rpm's.