1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 53Get this manual
Intake silencer, carburetor and fuel filter Refer to Chapter 3Reed valve 1Remove the reed valve seat bolts and then the reed valve assemblyNOTE: _
It is unnecessary to remove the bolt shown above when disassembling the reed valve assembly2Do not remove the carburetor set bolts (stud bolts) when removing the reed valve assembly1Remove the thermostat and washer from the cylinder head