How do you route the oil hoses on a 1977 Harley?
If you route your oil lines bases solely on a written description, there's a good chance of a misunderstanding which could lead to serious motor damage, therefore I'm posting the related link to an image: However, if you value your Harley and plan to do your own service & maintenance, you'd be wise to invest in a service manual.
It is the hose that carries your oil to the radiator or away from it, to be cooled. Oil gets very hot, and must cool to maintain efficiency. These are the thinner metal hoses running to your radiator into the sides. If your looking at the car from the front, the oil hoses are on the right. The ones on the left are transmission fluid coolant hoses.