2008 Honda Aquatrax ARX1500T3/T3D factory service manual, Page 41Get this manual
TECHNICAL FEATURES OIL THERMOSTAT OPERATION The oil thermostat consists of the valve, thermowax and springWhen the engine is cold, the oil cooler passage is held closed by the spring pressure and the bypass passage is fully open
THERMOWAX
VALVE As the engine warms up, the thermowax inside the thermostat is expanded by the heatThe expansion overcomes the spring pressure and opens the oil cooler passage while closing the bypass passage
BYPASS PASSAGE
THERMOWAX OIL COOLER P