Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 115Get this manual
Carburetor Disassembly 1Remove bolts, air intake, isolater, and diffuser
a Bolts (2) Air Intake
aScrews (4)
cClampSealCarburetor- O-RingIsolatorDiffuser i-BumperInsertO-Ring
4Remove plunger and springb