Polaris 650 RXL Brake Bulb Size

The Polaris 650 RXL brake uses 921 and 90 bulb sizes according to the provided technical specifications for the snowmobile. Available information covers the period from 1990 through 1997 for the specified components.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1994-1997	921
1990-1993	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The Polaris 650 RXL uses two distinct brake bulb types across its model years: the 921 for 1994-1997 and the 90 for 1990-1993.
The 921 is a T15 wedge bulb rated at 12V and 16W, conforming to ANSI standards applicable in the US and Canada.
The T15 designation refers to the bulb's tubular shape, with the number indicating its width in eighths of an inch. The wedge base requires no separate metal base, as the glass envelope itself forms the electrical contact.
The 90 is a single-filament bulb rated at 12V and 13W, also conforming to ANSI standards for the US and Canada.
The 90 bulb uses a BA15s bayonet base, a single-contact bayonet fitting where the "s" denotes a single contact point at the base center.
The 921 draws 16W compared to the 90's 13W, meaning the later 1994-1997 models operate the brake circuit at a higher wattage output.
The 921 and 90 use fundamentally different base types, wedge versus bayonet, making them physically non-interchangeable despite sharing the same 12V operating voltage.