Mercury 40 Service Manual page 180

1. Install idle mixture screw. Lightly seat idle mixture screw and then back out 2.5 turns.
NOTE: 45 hp Models – Use Screw Adjuster (91-809906A1) to install idle mixture screw.
a -
b -
c -
2. Install nozzle and jets.
a -
b -
c -
d -
3. Install float pin and needle valve. Needle valve should slide into valve seat on float.
a
a -
b -
c -
d -
90-828631R3 MARCH 1999
a
b
Idle Mixture Spring
Idle Mixture Screw
Plug
a
b
Plug
Nozzle
Main Jet
Pilot Jet (#42)
b
Retaining Screw
Float
Float Pin
Needle Valve
53674
c
c
d
53676
c
d
53676
CARBURETOR
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