Universal Atomic 4 User Manual

At high speeds the fuel flows from the fuel chamber through the main jet and into the main discharge jet
where it is mixed with air admitted by the well vent, and the air-fuel mixture is then discharged into the air
stream of the carburetor.
CHOKE SYSTEM
The choke, consists of a valve mounted on a shaft located in the air entrance and operated externally by a
lever mounted on the shaft. The choke valve is used to restrict the air entering the carburetor. This increases
the suction on the jets when starting the engine. The choke valve is of a "semi-automatic" type, having a
poppet valve incorporated in its design, which is controlled by a spring.
The poppet valve opens automatically when the engine starts and admits air to avoid over-choking or
flooding of the engine. The mixture required for starting is considerably richer than that needed to develop
power at normal temperatures. As the engine fires and speed and suction are increased, the mixture ratio
must be rapidly reduced. This change is accomplished through adjustment of the choke valve and the
automatic opening of the poppet valve to admit more air when the engine fires.
FLOAT SYSTEM
The "A" dimension should be 1-5/32" plus or minus 3/64".
Float Level. Check position or float assembly for correct measurement to obtain proper float level using

Universal Atomic 4 Specifications

General

Brand	Universal
Model	Atomic 4
Category	Engine
Language	English