1978 Johnson 175, 200, 235 HP Outboard Service Repair Manual P/N JM-7810, Page 104Get this manual
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Using 5 inch thinwall socket, remove countersunk screwSee Figu 6-8 REMOVAL OF EXHAUST HOUSING AND ADAPTER
1 Two each port al1d starboard
ExJ1aust Cover Sc rews
1 Screws