Analysis Of Motorcycle Troubles; Analysis Of Poor Idle Speed Of Engine; Chapter 5 Troubleshooting - ZONGSHEN ZS250GY-3 Service Manual

Chapter 5 Analysis of Motorcycle Troubles
No idle speed
of engine
Check the compressing
pressure of cylinder.
The
The comprssing
comprssing
p r e s s u r e o f
pressure of
c y l i n d e r i s
cylinder is
normal.
not enough.
[1]Check whether the outer connection part of engine
has leakage.
[2]Check whether valve timing is normal.
[3]Check whether the valve clearance is too narrow.
[4]Check whether the seal between valve and valve
seat is good.
[5]Check whether the piston ring is broken off or
dead or has poor elasticity.
[6]Check the abrasion of piston ring and cylinder.
Section 1 Analysis of Engine Trouble

1.1 Analysis of Poor Idle Speed of Engine

poor idle speed of
engine
The idle speed of
engine is too high.
Pull the valve of with
hands and check whether
it is completely closed.
Yes
Check whether the steel wire
Shut off ignition
of throttle control cable can
switch and hold for
be flexibly pulled outside the
10s of downtime,
cover of cable and whether
then restart switch
valve spring is too soft.
when idling stepping
motor returns.
Check air passage of
throttle valve
Air passage has carbon
deposition seriously.
Clean the passage.
There is no idling output
after cleaning.
Check it by using fault
diagnosis tester.
The idle speed of
engine is unstable.
C h e c k w h e t h e r e n g i n e
ignition is timing.
Yes
No
[ 1 ] C h e c k w h e t h e r
t h e C D I d e v i c e h a s
problems.
[2]Check whether the
flywheel of generator and
the triggering coil are
loose.
Check by fault diagnosis
tester if idling is still high.
Check the mixed ratio of
combustible mixed gas.
Check whether the electrode
clearance of spark plug is too
small.
Yes
Adjust electrode
clearance.
No
No
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