2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 462Get this manual
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TIGHTENING TORQUE POWER TRAIN
Tightening torque Remarks Nm mkg ftlb Primary sheave (1st) 120 12.0 85 Tighten the bolts in two (2nd) 60 6.0 43 stagesSee NOTESpider and sliding sheave 200 2