• I have recently acquired a 1972 rv50, and I was wondering if there is a free online manual which anyone can recommend. At this point I am interested in as detailed explanation/schematic of the wiring relating to the charging system, as the integrity of the wiring servicing this unit has been compromised. I have found some schematics online but it is still not clear to me what particular wire from the harness servicing the charging/ignition system goes where. There are five wires in the harness: yellow with a red strip (YR), yellow (Y), green with a white strip (G/W), green (G), and black (B). If anyone knows where these wires go precisely, I would appreciate the input. Also, tune up specifications would be appreciated.