2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Repair Manual P/N 5005638, Page 166Get this manual
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FUEL SYSTEM INTAKE MANIFOLD Inspect the intake manifold:gasket surfaces must smooth and free of nicks Use machinist's straightedge to check for flatness indirectionsThe gasket surface must flat, 0.003