The Yamaha YX600 Radian uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 1986 to 1990.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Yamaha YX600 Radian uses the 9003 bulb for both high beam and low beam headlight positions across the 1986-1990 model years.
The 9003 is an ANSI-standard halogen bulb recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament design rated at 60 watts for high beam and 55 watts for low beam.
Because both headlight positions share the same 9003 specification, a single bulb type serves the full headlight assembly on the YX600 Radian.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar. A bulb with a different base type is not physically compatible with this socket.
The 9003 and H4 bulb types share the same P43t base and dual-filament halogen construction, making them functionally interchangeable in many applications, though the 9003 designation follows ANSI standards while H4 follows ECE standards used in Europe.