ZONGSHEN ZS250GY-3, Service Manual

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59
1.3 Analysis of Engine Start
There is strong blue and blue purple spark
spurt between electrode.
poor spark or no spark
between electrode
Unscrew the cap of spark plug and check whether
there is spark spurt with high-voltage coil.
Check whether engine ignition is
timing.
T h e r e i s s t r o n g
blue spark spurt
poor spark or
no spark
[1]Check whether the CDI
device has problems.
[2]Check whether the
flywheel of generator and
the triggering coil are
loose.
Pull out fuel injector,
start ,check whether
f u e l s p u r t e d i s
atomised.
Check whether
there is gas in
fuel tank.
Engine cannot be started or is
hard to be started.
Check ignition system.
Remove spark plug piston and check whether there is carbon
deposit between the electrode of spark plug.
Check whether there is spark spurt
between the electrode of spark plug.
Clean out carbon deposit.
Check whether there is
something wrong with spark
plug and spark plug cap.
Check the compressing
pressure of cylinder with
Barometer
Yes No
Generator ignition
s y s t e m h a s n o
connecting point.
[1]Check whether
ignition coil has
short circuit or open
circuit.
[2]Check whether
triggering coil has
short circuit or open
circuit.
Engine can continue
working after starting.
[1]Check whether the outer connection of engine
has leakage.
[2]Check whether valve is timing.
[3]Check whether valve clearance is too small.
[4]Check whether the seal of valve and valve
holder is good.
[5]Check whether piston ring breaks off or is dead
or has insufficient elasticity.
[6]Check the abrasion of piston ring and cylinder.
[1]Check whether the air hole of
fuel tank cap is blocked.
[2]Check whether air cleaner
and fuel switch are blocked.
[3]Check whether fuel switch is
in good working condition.
[4]Check whether fuel tube is
broken.
[5]
Check whether connector of fuel
nozzle and fuel pump assembly is
loose.
The electrode of
spark plug is wet.
Dip a little gas in cylinder and
try to start.
Check whether air filter is
blocked.
The electrode of
spark plug is dry.
The cylinder
pressure is
sufficient.
C h e c k w i t h f a u l t
diagnosis tester
C h e c k w i t h f a u l t
diagnosis tester
The running time is
too short or engine
has flameout af ter
starting.
Add gas.
Dismantle spark
plug and check it.
The cylinder
p r e s s u r e i s
insufficient
.
No
Yes
No
Yes
Yes
No
C h e c k
whether there
is something
wrong with CDI
device.
Check whether
the inner circuit
of ignition system
has short circuit or
open circuit.
Check whether
the ignition
coil has short
circuit or open
circuit.
Check the
power supply
of ignition
e l e c t r i c a l
source