EA~1
TROUBLESHOOTING
,
.......
GENERAL
INFORMATION
TIP
---------------
The following g
ui
de
fo
r troubleshooting does not
cover all the possible causes of troubl
e.
It
should
be helpful, however,
as
a guide
to
basic trouble-
shooting. Refer to the relati
ve
procedure
in
this
manual for checks, adjustments, and replace-
ment
of
parts.
E
AS3Q.l.
10
STARTING FAILURES
Engine
1. Cylinder(s) and cylinder head(s)
• Loose spark plug
• Loose cy
li
nder head
or
cylinder
• Damaged cylinder head gasket
• Worn or damaged cy
li
nder
• Incorrect valve clearance
• Improperly sealed valve
• Incorrect valve-to-valve-seat contact
• Incorrect
va
lve timing
• Faulty valve spring
• Seized valve
2. Piston(s) and piston ring(s)
• Imprope
rl
y installed piston ring
• Damaged, worn
or
fatigued piston ring
• Seized piston ring
• Seized or damaged piston
3. Air filter
• Improperly
in
stalled air filter
• Clogged a
ir
filter element
4. Crankcase and crankshaft
• Improperly assembled crankcase
• Seized crankshaft
F
ue
l
system
1. Fuel tank
• Empty fuel tank
• Clogged fuel tank cap breather hole
• Deteriorated or contam
in
at
ed
f
ue
l
• Clogged or damaged fuel hose
2. Fuel pump
• Faulty fuel pump
• Faulty fuel pump relay
3. Throttle body (-ies)
• Deteriorated
or
contaminated f
ue
l
• Sucked-in air
Electrical
system
1. Battery
• Discharged battery
• Faulty battery
9-1
TROUBLESHOOTING
2. Fuse(s)
• Blown, damaged
or
incorrect fuse
• Improperly installed fuse
3. Spark plug(s)
• Incorrect spark plug gap
• Incorrect spark plug heat
ra
nge
• Fo
ul
ed spark pl
ug
• Worn
or
damaged electrode
• Worn
or
damaged insulator
4. Ig
ni
tion coil(s)
• Cracked
or
bro
ken ignit
io
n coil body
• Broken
or
shorted primary or secondary
co
il
s
5. Ignition system
• Faul
ty
ECU
• Fa
ul
ty
crankshaft position sensor
• Broken generator rotor woodruff key
6.
Switches and wiring
• Fa
ul
ty
main
sw
itch
• Faulty start/engine st
op
switch
• Broken
or
shorted wiring
• Faul
ty
gear positi
on
sensor
• Faulty sidestand switch
• Faul
ty
c
lu
tc
h swit
ch
• Improperly grounded circuit
• Loose connections
7.
Starting system
• Faulty starter motor
• Faulty starter relay
• Faul
ty
starting circuit cut-off relay
• Faul
ty
starter clutch
....,..,.
INCORRECT ENGINE IDLING SPEED
Engine
1. Cy
li
nder(s) and cylinder head(s)
• Incorrect valve clearance
• Damaged valve t
ra
in components
2. Air filter
• Clogged air filter element
Fuel
sys
tem
1.
Throttle body (-ies)
• Damaged
or
loose throttle body
jo
int
• Improperly synchronized throttle bodies
• Improper throttle
gr
ip tree play
• Flooded throttle body
• Faul
ty
air
in
duction system
Electrical
system
1.
Battery
• Discharged battery
• Fa
ul
ty
battery
2. Spark plug(s)
• Incorrect spark pl
ug
gap
• Incorrect spark pl
ug
heat range
• Fouled spark pl
ug
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