1999 EE Johnson Outboards 25, 35 3-Cylinder Service Repair Manual P/N 787029, Page 201Get this manual
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2 Apply Gasket Seaing Compound to the threads of the single shorter mounting screw Install the screw into the hole in the exhaust passage of the extensionTighten the screw to 192-216 inIbs(22-25 Nm)Re