Altitude compensating system of a carburetor mounted on a vehicle

摘要

An altitude compensating system of a carburetor for obtaining a desirable enriched air fuel ratio. The system comprises: a device for enriching the air fuel ratio after the engine load has reached a predetermined first value; an altitude compensating valve device for supplying compensating air in accordance with changes in altitude; a control valve device communicated with the altitude compensating valve device for permitting the compensating air to pass after the engine load has reached a predetermined second value, and; a switching valve device disposed at a position between the control valve device and a main jet of a carburetor and interlocked with a throttle valve of the carburetor for switching the compensating air.