| 摘要 |
A carburetor with a fuel nozzle in the throat, an upstream butterfly valve, a downstream butterfly valve, a first vacuum actuator for controlling the upstream butterfly valve as a function of vacuum in the throat, and a second vacuum actuator for controlling pre-mix air supply to the fuel nozzle as a function of vacuum downstream from the downstream butterfly valve. A cold start control for disabling the second vacuum actuator for a predetermined period of time at starting to block flow of pre-mix air to the fuel nozzle, including a cold start valve with a thermal responsive bimetal and a resistance heater for timing of the cold start operation. A main fuel control valve with an idle bypass passage therethrough, and means for adjusting the rate of flow through the idle bypass passage.
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