The KTM 350 EXC-F headlight bulb uses an HS1 size, designated as 6235B for both high and low beam functions. The replacement chart covers 2012 through 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 KTM 350 EXC-F uses the HS1 bulb type for both high beam and low beam headlights across the 2014-2019 model years.
The HS1 is a dual-filament halogen bulb, meaning a single unit serves both the high and low beam functions within one housing rather than requiring separate bulbs for each beam.
The HS1 operates at 12 volts with a 35W/35W output rating, where each wattage figure corresponds to one of its two filaments.
The HS1 uses a PX43t base, a bayonet-style mount specific to motorcycle headlight applications, and is not interchangeable with common automotive bulb bases such as H4 despite similar dual-filament construction.
The HS1 conforms to ECE standards, reflecting its recognition across European and worldwide markets as a regulated motorcycle lighting specification.
The 2012-2013 model years use the 6235B for both beam positions, a festoon-style bulb with blue tinted glass rated at 12 volts and classified under the ANSI standard used in the United States and Canada.
The 6235B and HS1 differ in both base type and physical form, making them non-interchangeable despite sharing a 12-volt operating voltage.
The transition between bulb types at the 2013-2014 boundary means that replacement parts sourced for 2012-2013 units are not compatible with 2014-2019 units of the same model.