clean valve, choke of engine and intake-tube, improve the air-fuel ratio, reduce exhaust emission, Increasing the fuel effciency Air intaking system cleanerVolume: 500mlGross Weight: 493g Thotoughly cleaning the colloid and carbon deposition from the air damper, choke of engine, intake-tube, and so on.Improving function of air intaking, the air-fuel ratio, reduce exhaust emission, stabilize the ...