1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 168Get this manual
7Clean and degrease the exhaust housing and adapter mating surfaces with OIVIC Cleaning SolventApply OIVIC Gel-Seal "to adapter flange of the outer exhaust housing
I1ID [1] 8Place the adapter onto the outer exhaust housingHand tighten the five small retaining screws
9Align the adapter with outer exhaust housing by placing two or more of the long powerhead retaining screws through the adapter and outer exhaust housing10Apply OIVIC Nut Lock to threads of the front two upper thrust mount screwsPlace the ground lead CD under head of the starboard screw