1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Repair Manual P/N 520205, Page 203Get this manual
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2 Apply QIIC Gasket Seaing Compound to the threads of the single shorter mounting screw Install the screw into the hole in the exhaust passage of the extension Tighten the screw to 192-216 in Ibs(22-2