Honda Motorcycle CRF250L front turn signal bulbs use P21/5W size while rear turn signal bulbs use P21W size. The replacement chart covers 2013 through 2020 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 Honda Motorcycle CRF250L uses the P21/5W bulb in the front turn signals across all documented model years from 2013-2020.
The P21/5W is a dual-filament bulb rated at 12V with a 21W primary filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The BAY15d base features two offset pins, which physically prevents it from being inserted in the wrong orientation, a design that distinguishes it from single-filament equivalents.
The rear turn signals on the CRF250L use the P21W bulb across all documented model years from 2013-2020.
The P21W is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base, which uses a single pin and is not interchangeable with the BAY15d base used at the front.
Both the P21/5W and P21W conform to ECE standards, indicating they are approved for road use in Europe and other markets that follow ECE regulations.
The front and rear turn signals on the Honda Motorcycle CRF250L require different bulb types, and the two are not interchangeable due to differing base configurations and filament counts.
The dual-filament design of the P21/5W front bulb allows it to serve more than one lighting function, with the lower-wattage filament typically assigned to a secondary role such as a position or parking light.