2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 346Get this manual
SHEAVE OFFSET ADJUSTMENTLUBRICATION LUBRICATION
INSP ADJ
3Measure: Secondary sheave freeplay (clearance) Use feeler gaugeOut of specification AdjustSecondary sheave free play (clearance): 1.02.0 mm (0.040.08 in)