Abnormal sound of rear wheel of Xiaomi go-kart

The bolt is loose. The thumping sound of the wheels behind the fuel door of Xiaomi kart is the sound of the valve or the fuel nozzle, and it is the noise caused by the loosening of the bolts on the chassis. It is recommended to go to the local after-sales store for maintenance to ensure normal driving and travel. Go-kart is a transliteration of English go-kart, which means miniature sports car. Go-karting began to appear in eastern Europe on 1940, and it didn't become popular and developed rapidly in Europe and America until the end of 1950s.