2008 Honda Aquatrax ARX1500T3/T3D factory service manual, Page 40Get this manual
TECHNICAL FEATURES OIL MANAGEMENT SYSTEMIOIL THERMOSTAT GENERAL DESCRIPTION
This watercraft incorporates an oil thermostat in the oil passageThe oil thermostat, which is located between the oil cooler and oil cooler bypass passage, helps shorten the engine warm up period by directing the oil into the bypass circuit while closing the oil cooler circuitSYSTEM CONSTRUCTION
When the engine oil temperature is below the opening threshold of the oil thermostat (95101 Cl203217 F), the valve is completely closed and the engine oil bypasses the water-cooled oil cooler and circulates back to the engineWhen the engine oil temperature reaches the opening threshold of the oil thermostat, the valve opens and engine oil is circulating through the oil cooler