Yamaha Tian Jian 150z suddenly became boring?

Yamaha Tian Jian 150 motorcycle suddenly appeared obvious power shortage. First, check whether the fault light on the instrument flashes. If there is no problem with the fault light, check whether the air filter, nozzle and exhaust pipe are blocked, whether there is a problem with the spark plug, clean the throttle valve, and check whether there is a problem with the oil, such as clutch slipping due to excessive oil or poor oil quality, and whether the clutch plate is burnt out.