Yamaha F100B F100C Outboards Factory Service Manual, Page 227Get this manual
Upper case (F100B) Muffler assembly bolt B: 20 Nm (2.0 kgfm, 14 ftlb) 6Install the upper mounting nut and lower mounting nut 8, and then tighten them to the specified torquesNOTE: Before tightening the lower mounting nut, be sure to connect the ground lead to the lower mounting bolt7Install the oil pump assembly 9
Installing the upper case
1Install the upper mount and bolts into the upper case2Install the bolts 3, and then tighten them to the specified torque