Generic TR 125 Service Manual page 162

c) Check whether the exhaust system is blocked, for example, whether the three-way catalytic converter is
blocked due to burning oil or broken;
d) Check oil pressure and nozzle.
e) Check whether the fault lights are normal, or whether it is because only one cylinder can make normal
ignition
16.4.3.8 Fault phenomenon—slight fire phenomenon
Check whether the spark plug clearance is in line with the specification, 0.7 ~ 1 mm
16.4.3.9 Fault phenomenon—fault lights on, but code and fault do not match
Maybe the system ground wire connection is not solid, and reconnects the ground wire; reconnect it in 3
minutes after disconnecting the battery power leads and start the engine
16.4.3.10 Fault phenomenon—abnormal high fuel consumption
a) Check whether the oxygen sensors of both cylinders are installed in place; if in loose state, the oxygen
sensor makes wrong judgment that there is oil combustion in the cylinder, resulting in abnormally high
fuel consumption.
b) Observe the oxygen sensor readings in running of the engine after the engine mechanical parts and the
oxygen sensor are in normal state, in a normal water temperature, if the reading is always greater than 500
mV, check whether the injector spills
Attentions:
Most of the EFI parts are not repairable, so it is usual to replace the damaged parts after confirmation.
When starting the engine, do not operate any organization on the engine (including the throttle, do not
pull the throttle to start).
If the engine fault light is on in the engine running, make sure to identify the cause as soon as possible
and to debug it.
Leaded gasoline must be used, because lead can damage the oxygen sensors and three-way catalytic
converters.
For oil consumption anomalies it should be resolved as soon as possible. Some substances in the oil
will damage the oxygen sensor and three-way catalytic converters.
The valve clearance should not be too small; if the exhaust does not close well; it will make the exhaust
temperature too high and shorten the life of three-way catalytic converters.
When temperature below 10 °C, if the finished enginecycle and engine run at low speed for too long,
the exhaust pipe may have a coke and go black, which is a normal phenomenon. It would disappear after
a high-speed operation for some time, or take appropriate means to make the engine coolant temperature
maintained at the specified temperature range.
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