2004-2005 660 Yamaha Rhino Factory Service Manual, Page 109Get this manual
ADJUSTING THE BRAKE LIGHT SWITCH CHECKING THE FINAL GEAR OIL LEVEL
1Check: brake light operation timing Incorrect Adjust2Adjust: brake light operation timing
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aHold the main body of the brake light switch so that it does not rotate and turn the adjusting nut in direction or until the brake light comes on at the proper timeDirection Direction Brake light comes on soonerBrake light comes on later