You could check your local library for a Chilton's Manual. Or you may be able to ask someone on a site like Craigslist or even a Harley Forum Site. Good Luck!
1981 sportster oil line diagram
The vacuum hose line routing diagram can be obtained from most Chevrolet dealerships. Obtaining a diagram will be the easiest way to visualize vacuum line routing.
The 1999 Dodge intrepid brake lines schematics diagram shows the routing of each brake line. The diagram will show the brake line routing from the master cylinder to each wheel.
A fuel line routing diagram for this vehicle can be found in the vehicles maintenance manual. It can also be found in the specific repair manual as well.
I've got an Accord, and under the hood is a label with "Vacuum Line Routing Diagram" printed on it. Start there first.
http://www.twowheelsforever.com/how-tos/how-tos.html a diagram is at this site with pictures
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Autozone dot com.
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Ask the dealership or a car parts shop if they would fax the diagram to you - I could not find one on-line . A wrecking yard may have the same make where you can see the routing itself .
The diagram should be located under your hood on your front cross member
chilton manuals have a lot of details