Fuel tank switch referred to as fuel switch, that is, gasoline pipeline switch; 1, open and close play a role in controlling the fuel circuit, 2, when the fuel tank oil level is very low, put the fuel switch handle in the "RES" position, can provide about 0.5L-1.5L reserve oil for emergency use of the engine, in order to avoid exhaustion of fuel, resulting in a motorcycle on the way out of fire.