ZONGSHEN ZS250GY-3(EFI), Maintenance Manual

Page: 65 / 79

58
EN
GL
ISH
1.3 Analysis of Engine Start
There is strong blue and blue purple spark spurt be-
tween electrode.
poor spark or no spark between electrode
Unscrew the cap of piston and check whether
there is spark spurt with high-voltage coil.
Check whether the engine igni-
tion is timing.
There is strong
blue spark spurt
poor spark or no
spark
[1]Check whether there is some-
thing wrong with CDI device.
[2]Check whether the flywheel
of generator and triggering coil
are loose.
Check whether
there is gas in fuel
tank.
Engine cannot be started or is hard
to be started.
Check ignition system.
Remove 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 car-
bon deposit.
Check whether there is some-
thing wrong with spark plug
and spark plug cap.
Check the compressing
pressure of cylinder with
Barometer
Yes
No
Generator ignition
system has no con-
necting point.
[1]Check whether igni-
tion coil has short circuit
or open circuit.
[2]Check whether trig-
gering coil has short cir-
cuit 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.
Dip a little gas in cylinder and try to start.
The electrode of spark
plug is dry.
The cylinder
pressure is
sufficient.
The running time is too
short or engine has flame-
out after starting.
Add gas.
Dismantle spark plug
and check it.
The cylinder
pressure is
insufficient.
No
Yes
No
Yes
Yes
ON
Check whether
there is some-
thing wrong with
CDI device.
Check whether the
inner circuit of ig-
nition system has
short circuit or
open circuit.
Check whether
the ignition coil
has short circuit
or open circuit.
C h e c k t h e
power supply
of ignition elec-
trical source
Pull out fuel injector, start ,
c h e c k w h e t h e r f u e l
spurted is atomised.
①
Check whether venthole of fuel
tank cap is blocked.
②
Check whether fuel filter is
blocked.
③
Check whether fuel nozzle is
blocked.
④
Check whether fuel tube
is broken.
⑤
Check whether connector of fuel
nozzle and fuel pump assembly is loose.
Check whether air filter is blocked.
Check with fault di-
agnosis tester
The electrode of spark
plug is wet.
Check with fault diagnosis
tester