Mercury 305 CID - Cleaning and Inspection

MERCARB 2 BARREL CARBURETOR - 5B-1790-823225--1 1096
2. Remove idle mixture adjusting needle and
spring.
72293
b
a
a - Idle Mixture Adjusting Needle
b - Spring
3. Remove idle speed adjustment screw and
spring, if replacement is necessary.
72395
b
a
a - Idle Speed Screw
b - Spring
IMPORTANT: DO NOT remove throttle valves. If
any of the throttle body parts are found to be
worn or damaged, complete throttle body assem-
bly MUST BE replaced. Throttle body assembly
can be cleaned in carburetor cleaner.
Cleaning and Inspection
IMPORTANT: DO NOT use a wire or drill to clean
jet passages or tubes in carburetor, as this may
enlarge orifices and seriously affect carburetor
calibration.
!
CAUTION
To avoid damage to carburetor DO NOT leave car-
buretor in immersion type carburetor cleaner for
more than two hours.
IMPORTANT: DO NOT clean float bowl gasket
surfaces with a gasket scraper or knife, as seal-
ing bead will be damaged and float bowl replace-
ment will be necessary.
!
CAUTION
The float assembly, float needle, accelerator
pump plunger, and fuel filter MUST NOT BE im-
mersed in carburetor cleaner, as they will swell,
harden, and/or distort.
72410
b
c
d
a
a - Accelerator Pump Plunger
b - Float Needle
c - Fuel Filter
d - Float Assembly
!
WARNING
Avoid personal injury by always wearing safety
goggles when using compressed air.