The KYMCO Mongoose 90 headlight bulb uses an HS1 size for both high beam and low beam functions. The replacement chart covers 2012 to 2018 production 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 is a dual-filament halogen bulb operating at 12 volts with a 35W/35W output rating, meaning both the high and low beam filaments draw equal wattage. It uses a PX43t base and is governed by ECE standards, making it a globally recognized specification common in motorcycle lighting applications.
The KYMCO Mongoose 90 uses the HS1 bulb size for both its high beam and low beam headlight positions across the 2012-2018 model years, meaning a single bulb type serves both lighting functions simultaneously through its dual-filament design.
Because the HS1 carries both filaments within one unit, the high and low beam functions are not served by separate bulbs. Replacing one beam position requires handling the same physical bulb that also governs the other, which is a relevant consideration during any headlight service.
The PX43t base is a bayonet-style fitting specific to the HS1 and is not interchangeable with other common motorcycle bulb bases such as the BA20d, despite both being dual-filament halogen types. Substituting an incompatible base type would prevent proper seating in the headlight housing.
The ECE (Economic Commission for Europe) rating on the HS1 indicates the bulb meets internationally recognized photometric and safety standards, which are distinct from DOT standards used in North American automotive lighting regulation.