1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 140Get this manual
ENGINE ASSEMBLY AND ADJUSTMENT
5Tighten: Nut (Primary drive gear)
Place the folded rag (T) between the teeth of the drive gear (2) and driven gear (3) to lock them
Nut (Primary Drive Gear): 65 (6.5 mekg, 47 ftolb)