Suzuki Motorcycle LT-F400F KingQuad FS/FSi headlight bulbs use HS1 size for both high beam and low beam functions. The replacement chart covers 2008 to 2019 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 Suzuki Motorcycle LT-F400F KingQuad FS/FSi uses the HS1 bulb type for both high beam and low beam headlights across the 2008-2019 model years.
The HS1 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both the high beam and low beam functions within one housing.
The HS1 operates at 12 volts with a wattage rating of 35W per filament, giving it a balanced 35W/35W output across both beam modes.
The HS1 uses a PX43t base, a bayonet-style mount with a specific pin configuration designed for motorcycle headlight applications, which is not interchangeable with common automotive base types such as H4 despite similar dual-filament functionality.
The HS1 is governed by ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide, distinguishing it from bulbs designed solely to SAE or JIS standards.
Because both the high beam and low beam positions share the same HS1 specification across all listed model years, a single bulb type serves the entire headlight assembly on this vehicle.