Generic TR 125 Service Manual page 144

16.2.3.3 Clearing of throttle body
Use throttle cleaner to clean the throttle body; spray the cleaner on the internal wall of the throttle body and
brush gently off the dust, coke, etc.; make sure no dirt clogging the side-channel.
16.2.4 cylinder head temperature sensor
16.2.4.1 Working principle of cylinder head temperature sensor:
The engine cylinder head temperature sensor is used for air-cooled engine to measure the engine cylinder head
temperature; within the temperature range of the sensor, its resistance varies with engine temperature, and its
temperature characteristic is the negative temperature coefficient resistance characteristics. It is a part which is
not maintainable.
16.2.4.1 Appearance of cylinder temperature sensor:
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Cylinder head
temperature sensor