The emission of BJ491 engine's double idle which is equipped with Motorola multipoint EFI system exceeded the standard level.

Under idle speed mode although emission volume consistency of pollutant is more bigger than other mode, the proportion of idle speed emission of the automobile isn't much.

Improvement of cold starting and cold idling circulation(engine warming up)combustion process of motorcycle gasoline engines by dual-spark plug-based rapid burning system was introduced.