Generic TR 125 Service Manual page 14

Fault Diagnosis
Start difficultly or start failed
Fault Diagnosis
Oil supplying No fuel
for fuel injector supplies to
is enough and
fuel injector
smooth
There is Weak spark or no
flashover in spark is in spark
spark plug. plug.
Compression Compression
pressure is pressure is too
normal low or none.
No Ignition With outbreak
outbreak phenomenon;
phenomenon
without start
of engine
Spark plug is Spark plug is
dry wet
Adjustment Check
Check if petrol
pump work well
Disassemble spark plug
and put it into spark plug
cover; connect engine to
check whether there is
flashover in spark plug.
Compression
pressure test
Disassemble spark
plug to check again
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Fault Cause
No fuel in gasoline box
Pipeline block in fuel injector of gasoline box
Block in the pipeline of gasoline pump
Pipeline block in evaporation controlling
system of fuel tank
Block in the gasoline filter
Oil pressure of gasoline pump is not enough.
Unhealthy spark plug
Pollution of spark plug
Unhealthy CDI Group
Unhealthy trigger
Open circuit / short circuit of ignition coil
Open circuit or short circuit in ignition coil
Unhealthy master switch
Unhealthy charge coil
Unhealthy start clutch
Unhealthy cylinder plunger or packing ring
Air leakage of cylinder head gasket
Unhealthy automatic choke
Air in induction manifold
Incorrect ignition time
Bad adjustment of restriction adjustment
screw
Oil injection volume of fuel injector is over
Unhealthy automatic choke
Accelerator opens too much