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ENGLISH
1.3 Fault diagnostic procedure for engine start failure or difficulty
There is a strong blue or bluish
violet spark between electrodes
No spark or weak spark between poles of spark plug
Unscrew the spark plug cap, make a
spark-over test to high-voltage cable
Check if the engine ignition is normal
There is a strong
blue spark
No spark or weak spark
between poles of spark plug
1.Check if the CDI ignition
is faulty
2.Check the magnetic
motor flywheel and trigger
coil for any looseness
A f t e r t h e i n j e c t o r i s
unplugged, star t the
ignition to see if the fuel
is atomized.
to check if
there is fuel in
the fuel tank
The engine fails to start or has difficulty in start-up
Check the ignition system
Remove the spark plug and check if the electrodes
of spark plug are connected
Make a spark-over test
to the spark plug
Check the ignition system
Check if the spark plug or
spark plug cap is faulty
Check the
ignition
power upply
Check if the
ignition coil is
short-circuited
o r o p e n -
circuited
C h e c k i f t h e
c i r c u i t i n t h e
ignition system
is short-circuited
or
Check if the
CDI ignition is
faulty
yes
yes
yes
yes
No
Non-contact magneto
ignition system
1. Check if the ignition
power supply coil is
short-circuited or open-
circuited
2. Check if the trigger coil
is short-circuited or open-
circuited
Continue to work after start-up
Check if the air
cleaner is clogged.
①
Check the external joints for any leakage
②
Check the air is distributed at correct time
③
Check if the valve clearance is too small
④
Check the sealing between valve and the
valve seat
⑤
Check if the piston ring is broken or stuck
in the ring groove or lack of elasticity
⑥
Check the piston ring and cylinder for any
abrasion
①
Check the fuel tank cover
vent for any obstruction
②
Check if the fuel filter is
clogged.
③
Check if the fuel nozzle
is blocked
④
Check if the fuel pipe is
broken
S p a r k p l u g
electrodes are damp
Drip a small amount of gasoline into the cylinder and try to start
Spark plug electrodes are dry
Insufficient
compression pressure
in cylinder
Running time is very short
or it shuts down after start-up
Fill with
gasoline
R e m o v e a n d
check the spark
plug
S u f f i c i e n t
compression
pressure in
cylinder
Use the diagnostic tool to check
Use the diagnostic
tool to check
Use a cylinder pressure
g a u g e M e a s u r e t h e
compression pressure
No
No
No
