Yamaha F100B F100C Outboards Factory Service Manual, Page 113Get this manual
Timing belt and sprockets 7Tighten the tensioner bolts to the specified torqueFlywheel holder: 90890-06522
Driven sprocket bolt 2: 60 Nm (6.0 kgfm, 43 ftlb)
10Tighten the drive sprocket nut to the specified torque, and then install the breather hose
S60C5290
S60C5310
Tensioner bolt 0: 39 Nm (3.9 kgfm, 28 ftlb)