Engine Runs Poorly At Idle - Mercury 305 CID Service Manual

Engine Runs Poorly at Idle

Symptoms
E Engine surges E Engine surges
Low top speed or lack of power L Low top speed or lack of power
P P Poor cold engine operation ld ld
Engine stalls E E E
Hard starting
Index
90-823225--1 1096
i i
d l k f
i i i i
i i i ll ll ll
Cause
A. Main metering jets
B. Leaking gaskets
C. Float adjustment
D. Saturated float
E. Power piston or valve
F. Throttle valves
A. Power piston or valve
B. Float adjustment
C. Main metering jets
D. Leaking gaskets
A. Idle RPM too low
B. Idle mixture screws
C. Throttle valves
D. Automatic choke
E. Engine flooding
A. Idle RPM too low
B. Idle mixture screws
C. Engine flooding
D. Automatic choke
E. Dirt in carburetor
F. Accelerator pump
G. Leaking gaskets
Refer to "Engine Starts Hard"
TROUBLESHOOTING - 1C-15