BMW R 1250RS Rider's Manual page 177

Remove the screw 1.
Remove the lens from the
housing by pulling it outward
on the side with the screw.
To prevent contaminants from
being deposited on the glass
surface, always use a clean, dry
cloth to hold the light source.
Remove bulb 1 from
light housing by turning it
counterclockwise.
Replace defective light source.
Bulbs for flashing turn
indicators, front
RY10W / 12 V / 10 W
Bulbs for flashing turn
indicators, rear
RY10W / 12 V / 10 W
Install light source 1 by turning
clockwise in light housing.
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