Generic TR 125 Service Manual page 16

Rotation unsmooth (especially in low speed)
Fault Diagnosis
Normal
Adjust well Adjust not well
No air in
Spark plug Spark plug
flashover
flashover not well
well
Well Not well
Adjustment Check
Ignition time
adjustment
Abnormal
Air damper restriction
screw adjustment
Air into shim
Air in
Disassemble spark plug
to check the flashover
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Fault Cause
Unhealthy CDI group
Unhealthy trigger
Gas mixture is too thin (loosen bolt)
Gas mixture is too strong (tighten bolt)
Heat filter not well
Loose restrictor fixed nut
Broken shim
Broken negative pressure pipe
Spark plug not well or polluted
CDI not well
Ignition coil not well
Spark plug guide line open circuit or
short circuit
Master switch not well
Negative pressure pipeline damage
Air circulation hole blocked