1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Repair Manual, P/N 507263, Page 154Get this manual
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29 Tighten the six main bearing screws in stages to final torque of 144-168 inIbs(16-19 Nm)Begin with the center screws and work outward in spiral patternTighten the smaller crankcase screws to torque