2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 118Get this manual
ADJUSTING THE REAR BRAKE CHECKING THE BRAKE FLUID LEVEL Adjust
the select lever control cableRefer to "ADJUSTING THE SELECT LEVER CONTROL CABLE AND SHIFT ROD"Install the rear brake master cylinder cover
WARNING
After this adjustment is performed, lift the front and rear wheels off the ground by placing block under the engine, and spin the rear wheels to ensure there is no brake dragIf any brake drag is noticed perform the above steps again