2000 Johnson/Evinrude SS 25, 35 3-Cylinder outboards Service Manual, Page 64Get this manual
Carburetor Servicing Removal
1Avoid accidental start-up while servicing engine; twist and remove all spark plug leads2Turn the retainer knob located in the middle of the air silencer and remove the silencer from the engineDisconnect the drain hose from the nipple at the bottom of the silencer