Oil quantity monitoring system for motorcycle

An oil quantity monitoring system for a motorcycle provided with a hydraulic clutch disengaged/engaged and brought by hydraulic pressure into a neutral state where power of an engine is interrupted from a drive wheel side and into a drive state where the power of the engine is applied to the drive wheel side, comprising:

• an oil level sensor for detecting an oil level of an oil tank for storing operating oil of the hydraulic clutch and issuing an oil level-lowering warning signal when the oil level lowers to a prescribed oil level;
• a hydraulic sensor for detecting hydraulic pressure of the operating oil of the hydraulic clutch adapted to receive the operating oil supplied thereto from the oil tank via a hydraulic circuit;
• and
• a switching solenoid and a switching spool valve, each being provided in an oil passageway extending between an oil pump and the hydraulic clutch for controlling a flow of the operating oil to the hydraulic clutch;
• wherein the system is set so that when the oil level of the oil tank lowers, the oil level sensor issues the oil level-lowering warning signal before the hydraulic sensor issues a hydraulic pressure-lowering detection signal.