Economizer enrichment system
In order to meet the economic requirements, the main oil system supplies a leaner mixture under most working conditions. However, when the throttle valve is close to full open, the maximum power is required, which requires the supply of rich mixture. A fuel saver is usually used for this purpose. There are two types of fuel savers: mechanical and vacuum. The former uses a lever connected to the throttle valve, and the latter uses the vacuum behind the throttle valve to switch the fuel saver valve. When the valve is opened, a part of the fuel is injected through the power fuel injection hole to enrich the mixture, thereby obtaining the maximum power.