A motorcycle is required to have all of the following equipment, except:

In Utah, all motorcycles must have one headlamp; one taillamp; either a taillamp or separate lamp to illuminate the rear license plate with a white light; one red reflector on the rear; one stop lamp; a braking system; a horn or other warning device; a muffler and emission system; a mirror; tires with tread depths of at least 2/32 of an inch; footrests (if the motorcycle is meant to carry passengers); handlebars; and turn signals (if manufactured after 1973).
DMV Writen Test