Wiring diagram in full color of 1985 USA RZ350 - click image below for a PDF.

List of wires and functions for the Yamaha 2000 YZF-R1 and the 1985 RZ350

R1 Wiring Functions:
Sky Blue/White - Neutral Light
Dark Brown - Left Turn Signal
Dark Green - Right Turn Signal
Black/Red - Oil Level
Green/White - Fuel Level
Green/Black - Cooling Fan Relay
Brown - Switched 12v
Red/Green - Unswitched 12v
Black - Ground
Yellow - High Beam Light
Blue - Meter Back Lights
White - Speed Sensor Input
Blue/Yellow - Speed Sensor Power
Green/Red - Temp Sensor Input
Black/Blue - Temp Sensor Ground
Yellow/Black - Tach Input.

RZ Wiring Functions:
Blue/White - Meter Lights
Sky Blue - Neutral Light
Dark Brown - Left Turn Signal
Dark Green - Right Turn Signal
Black/Red - Oil Level
Brown - Switched 12v
Black - Ground
Yellow - High Beam Light
Red - Unswitched 12v
White/Green - Speedometer Reed Switch (at gauge cluster end)
White/Green - Flywheel pick-up (at motor connection)