Motorcycle engine grease oil monitor

The utility model relates to a grease oil monitor for motorcycle engines, which comprises a bolt; an output plug is arranged at one side of the bolt releasing from threads; a nut is arranged on the threads of the bolt; a sealing ring is arranged at one side of the nut near the bolt and the threads; simultaneously, a circuit board and a support frame are fixedly arranged at the end part of the threads of the bolt; the support frame is hinged with one end of a contact sheet; a float is fixedly arranged at the other end of the contact sheet; an upper and a lower contacts are arranged on the position of the circuit board corresponding to the contact sheet. The utility model automatically monitors the grease oil amount of the engine, takes different measures according to different grease oil amounts, and protects the safety of the engine at a maximum degree. Simultaneously, the utility model can be directly arranged on the existing motorcycle engine which is not modified.