Yamaha 115-225 HP Outboards Service Manual, Page 118Get this manual
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14) Put the crank case cover on the cylinder body, place all the bolts in the bolt holes of the crank case and finger-tighten themThen, torque them in two steps and in the sequence specified1st step: M8 bolts: 10.0 Nm M10 bolts: 20.0 Nm 2nd step: M8 bolts: 18.0 Nm M10 bolts: 40.0 Nm