The Yamaha YZF750R headlight bulb uses HS1 size for both high beam and low beam applications. The replacement chart covers 1994 to 1998 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The HS1 bulb is the sole bulb type specified across all headlight positions on the Yamaha YZF750R for the 1994-1998 model years.
The HS1 is a dual-filament halogen bulb operating at 12 volts with a 35W/35W power rating, meaning both the high beam and low beam filaments draw 35 watts each.
The HS1 uses a PX43t base, a bayonet-style fitting designed specifically for motorcycle headlight applications, which physically differs from common automotive bulb bases such as H4.
The HS1 is governed by ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide, covering output, beam pattern, and construction requirements.
Both the high beam and low beam headlight positions on the Yamaha YZF750R share the same HS1 specification across all listed years, indicating a single bulb serves both functions through its dual-filament design.
Because the HS1 and H4 bulbs share a similar dual-filament halogen construction but differ in base type, the two are not interchangeable despite their functional resemblance.