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1.4 Analysis of engine overheating
Engine overheats.
Check whether the operation is correct.
[1]Check whether the gas no. is correct or
has stored for a long time.
[2]Check whether engine always runs with
the high speed or with loads.
Check cooling system.
Check whether there is sand or smeary
deposit on radiator.
Clean
air cooling engine
Yes
No
Yes
Check whether there is sand or smeary deposit on radiator.
Clean
Yes
No
Check whether there is enough fluid in the
channel.
C h e c k w h e t h e r t h e
c o n n e c t i n g p i p e i s
loose or damaged.
Check whether the
channel is unblocked.
Tighten or replace.
No
Yes
Yes
No
liquid cooled
engine
No
Check whether the engine
ignition is timing.
[1]Check whether CDI
device has problems.
[2]Check whether the
flywheel of generator and
triggering coil are loose.
Check whether clutch
slips.
Dismantle piston and check the color of piston dielectric.
Estimate the mixed ratio of mixed gas according to all kinds
of exceptional phenomena.
Spark plug dielectric is dark black.Exhaust
muffler emits black smoke when engine
runs with the medium/low speed.The
accelerating performance is bad and idle
speed is unstable.But it is normal when
with high speed.
spark plug dielectric
is brown.
Combustible mixed
gas is too thin.
Combustible mixed gas is thick.
Check whether cylinder
e x h a u s t p o r t a n d
e x h a u s t m u f f l e r a r e
blocked with carbon
deposite.
Check lubricating
system.
[1]Check whether the oil volume in
crankcase is insufficient.
[2]Check whether the oil in crankcase is
dirty or its mucosity is too bad.
[3]Check whether oil cleaner is blocked.
[4]Check whether oil pump is in good
working condition.
[5]Check whether lubricating way is
blocked.
Clutch slides.
Refer to 1.6.
Yes
No
Yes
No
Supply the same type of
liquid.
Check whether the pump
is damaged.
The ratio of Combustible mixed gas is normal.
①
Check whether air filter is blocked.
②
Check whether oxygen sensor is
working well.
③
Check fuel nozzle is in working
order.
①
Check whether fuel filter
is blocked.
②
C h e c k w h e t h e r f u e l
nozzle is blocked.
③
Check the oxygen sensor
is working well.
spark plug dielectric is white.
When accelerating,engine
has intermission.The engine
power is insufficient.
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