HENGJIAN S8-Z300 Radiator Temperature Control Switch S8-Z300-20.2-10

The HENGJIAN temperature control switch S8-Z300-20.2-10 is a model-specific component of the Hengjian S8-Z300 radiator assembly, responsible for switching the cooling circuit according to coolant temperature in the water-cooled system.

By activating the cooling circuit at a factory-defined temperature point, this switch helps maintain a stable operating temperature for the 293.2 cc single-cylinder 2-stroke engine used in the Hengjian S8-Z300 range, even under demanding off-road conditions.

Key features

Dedicated temperature control switch developed for the Hengjian S8-Z300 radiator and cooling system group 20.2.
Factory-calibrated switching point matched to the S8-Z300 water-cooled 2-stroke engine for consistent thermal management.
Electrical on/off control of the cooling circuit based on coolant temperature measured at the radiator.
Designed to work with the original S8-Z300 wiring harness and radiator fan arrangement for reliable operation.
Compact, sealed construction engineered to withstand vibration, mud, moisture and temperature fluctuations typical of enduro use.

Technical details

Manufacturer	HENGJIAN
Part name	Radiator temperature control switch
Manufacturer reference	S8-Z300-20.2-10
Vehicle application	Hengjian S8-Z300 cooling system, radiator group 20.2 as listed in the factory parts catalog.
Engine platform	Single-cylinder, 2-stroke, water-cooled, approx. 293.2 cc Hengjian S8-Z300 engine family.
System role	Thermal switch for activating the cooling circuit based on radiator coolant temperature.
Component group	Radiator / cooling system electrical control

Typical use cases

Replacement of a worn, intermittent or non-functioning original temperature control switch on Hengjian S8-Z300 models.
Restoration of correct cooling behaviour after overheating, fan activation issues or irregular engine temperature.
Cooling system overhaul together with radiator, hoses, coolant and fans on S8-Z300 motorcycles used in intensive off-road conditions.
Use as an original-type spare part when returning a modified or heavily used S8-Z300 to factory cooling specifications.

Benefits in off-road and enduro riding

Helps protect the S8-Z300 2-stroke engine from thermal overload during slow, technical sections and extended climbs.
Supports consistent power delivery and throttle response by keeping coolant temperature within the intended operating window.
Matches the mechanical layout and electrical interface of the original S8-Z300 cooling system, simplifying installation and ensuring correct function.
Contributes to overall reliability of the cooling system when combined with clean radiators, correctly functioning fans and appropriate coolant quality.

Specification