Mercury 305 CID - Engine Runs Poorly at Idle

TROUBLESHOOTING - 1C-1590-823225--1 1096
Engine Runs Poorly at Idle
Symptoms Cause
Ei
A. Main metering jets
Ei
B. Leaking gaskets
Engine surges
C. Float adjustment
Engine
surges
D. Saturated float
E. Power piston or valve
F. Throttle valves
Ldlkf
A. Power piston or valve
Low top speed or lack of power
B. Float adjustment
Low
top
speed
or
lack
of
power
C. Main metering jets
D. Leaking gaskets
Pldi i
A. Idle RPM too low
Pldi i
B. Idle mixture screws
Poor cold engine operation
C. Throttle valves
D. Automatic choke
E. Engine flooding
Ei ll
A. Idle RPM too low
Ei ll
B. Idle mixture screws
Ei ll
C. Engine flooding
Engine stalls
D. Automatic choke
E. Dirt in carburetor
F. Accelerator pump
G. Leaking gaskets
Hard starting Refer to “Engine Starts Hard”