1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 282Get this manual
BRAKE DRUM INSPECTION
1.Measure: Brake drum inside diameter Out of specification ReplaceFront brake drum inside diameter: 160 mm (6.30 in) Wear limit: 161 mm (6.34 in)
2.lnspect: Brake drum inner surface Oilscratches Remove
Scratches
Use rag soaked in lacquer thinner or solventUse an emery cloth (lightly and evenly polishing)
REAR BRAKE ASSEMBL V