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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.
Check by fault diagnosis
tester if idling is still high.
Chapter 5 Analysis of Motorcycle Troubles
1.1 Analysis of Poor Idle Speed of Engine
poor idle speed of
engine
Check the mixed ratio of
combustible mixed gas.
Adjust electrode
clearance.
[ 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 whether the electrode
clearance of spark plug is too
small.
Check whether the steel wire
of throttle control cable can
be flexibly pulled outside the
cover of cable and whether
valve spring is too soft.
Shut off ignition
switch and hold for
10s of downtime,
then restart switch
when idling stepping
motor returns.
[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.
C h e c k w h e t h e r e n g i n e
ignition is timing.
Pull the valve of with
hands and check whether
it is completely closed.
Check the compressing
pressure of cylinder.
Yes
No
Yes
No
No
Yes
No idle speed
of engine
The idle speed of
engine is too high.
The idle speed of
engine is unstable.
The
comprssing
pressure of
cylinder is
not enough.
The comprssing
pressure of
c y l i n d e r i s
normal.
Section 1 Analysis of Engine Trouble
Summary of Contents for ZS250GY-3
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