59
16. TROUBLESHOOTING
Typical causes of engine troubles are listed in the following table.
Trouble
Cause
Ba
tte
ry c
ha
rgin
g f
ailu
re
Sta
rte
r m
oto
r d
oe
sn
't w
ork
En
gin
e s
tar
t fa
ilu
re
En
gin
e s
tu
m
ble
o
r s
tall
Ro
ug
h id
lin
g
Id
lin
g r
ev
olu
tio
n is
to
o h
igh
Po
or
ac
ce
ler
atio
n
En
gin
e o
ve
r-r
ev
olu
tio
n
En
gin
e o
ve
rh
ea
t
En
gin
e s
eiz
ing
Va
cu
um
p
re
ssu
re
d
efe
ctiv
e
Air
le
ak
ing
W
ate
r s
uc
tio
n f
ailu
re
Ins
uff
icie
nt
wa
te
r d
isc
ha
rge
Flo
od
lig
ht,
G
au
ge
la
m
p, H
ou
r m
ete
r,
W
arn
ing
la
m
p d
o
no
t w
ork
W
arn
ing
la
m
p f
las
hin
g
Action
Ca
us
ed
b
y S
uc
tio
n
Ca
us
ed
b
y P
um
p u
nit
Ca
us
ed
b
y P
lay
pip
e
Ca
us
ed
b
y E
ng
ine
u
nit
Fu
el a
nd
lu
bri
ca
tio
n
Fuel shortage
● ●
●
●
Refuel
Deterioration
of fuel
● ● ●
●
●
●
Replace with new
fuel.
Fuel tank air
vent clogging
● ● ●
●
●
●
Clean out
clogging.
Fuel filter
clogging
● ● ●
●
●
●
Clean out
clogging.
Fuel pump
failure
● ● ●
●
●
●
Replace.
Fuel pipe kink
or snap
● ● ●
●
●
●
Fix pipe kink or
snap.
Ele
ctr
ica
l
Spark plug cap
comes off
● ● ●
●
●
Plug in surely.
Use of
unspecified
spark plug
● ● ●
●
● ●
●
Replace with
specified spark
plug.
Spark plug
fouling (No
spark or weak
spark)
● ● ●
●
●
Clean or replace
with specified
spark plug.
Battery loose
connection,
terminal
corrosion or
expired
● ●
●
Clean terminal
and/ or tighten a
terminal screw. If
necessary
replace.
Battery
charger
defective
●
Check 7.5A fuse
and/or Battery
charger. Replace
if necessary.
7.5A fuse
blown
●
●
Replace with
spare fuse.
When the
blowout of the
fuse happens
repeatedly, check
a cause.
