Mercury 40

CARBURETOR
90-828631R3 MARCH 1999 Page 3B-29
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.
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c
a
b
a-Idle Mixture Spring
b-Idle Mixture Screw
c-Plug
2. Install nozzle and jets.
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b
c
d
a
a-Plug
b-Nozzle
c-Main Jet
d-Pilot Jet (#42)
3. Install float pin and needle valve. Needle valve should slide into valve seat on float.
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a
b
c
d
a-Retaining Screw
b-Float
c-Float Pin
d-Needle Valve