Date of Issue: February, 2005
2-12
© American Honda Motor Co., Inc.
FG110
g. PROBABLE CAUSES OF MAJOR CARBURETOR PROBLEMS
Symptom
Starting
Low speed
Acceleration/
deceleration
High
sp
eed
Probable causes
Hard s
tarting
O
v
erflow
, fuel leaking
Hard to
prime w
ith primer bulb
Eng
ine do
es not idle
Idle spe
ed too lo
w
Idle speed does not s
tabilize
S
talls w
h
en idling
Eng
ine do
es not acce
ler
a
te
Eng
ine st
alls at
d
e
cele
ratio
n
Po
or
a
cce
le
ra
tio
n
pe
rf
or
ma
n
c
e
Po
or
p
e
rfo
rm
a
nc
e
at
hig
h
sp
ee
d
Throttle stop screw out of adjustment
O
O
O
O
Fuel tank/line
Fuel filter clogged
O
O
O
O
O
O
O
Fuel line clogged
O
O
O
O
O
O
O
Air in fuel passage
O
O
O
O
O
O
O
Incorrect/deteriorated fuel
O
O
O
Pump diaphragm
Vacuum pulse leaking
O
O
Vacuum pulse passage clogged
O
O
Loose pump cover screw
O
O
O
Pump diaphragm faulty
O
O
O
Primer bulb
Primer bulb damaged
O
Check valve faulty
O
O
O
O
O
O
Carburetor not installed securely
O
O
O
O
Insulator gasket faulty
O
O
O
O
Metering lever
Lever damaged
O
O
O
O
O
Lever too high
O
O
O
O
Lever too low
O
Lever not operating properly
O
O
O
O
O
O
O
O
O
O
Metering lever spring
Spring deformed
O
O
O
Spring not installed properly
O
O
O
O
Metering diaphragm
Diaphragm damaged
O
O
O
O
O
O
Gasket faulty
O
O
O
O
Inlet needle valve
Stuck valve
O
O
O
Worn valve
O
O
O
O
O
O
O
Foreign matter stuck in valve
O
O
O
O
O
O
O
Summary of Contents for FG110
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