Starter System; Float System - Suzuki drz 400E Service Manual

FUEL AND LUBRICATION SYSTEM 4-9
STARTER (ENRICHER) SYSTEM
Pulling the starter (enricher) knob causes fuel to be drawn into the starter circuit from the float chamber 1.
The starter jet 2 meters this fuel, which then flows into the fuel passage 3 and mixes with the air coming
from the float chamber. The mixture, rich in fuel, reaches starter plunger 4 and mixes again with the air
coming through a passage 5 extending from behind the diaphragm.
The two successive mixtures of the fuel with the air provide the proper air/fuel mixture for starting. This
occurs when the mixture is sprayed out through the starter outlet port 6 into the main bore.

FLOAT SYSTEM

The float 1 and needle valve 2 work in conjunction with one
another. As the float moves up and down, so does the needle
valve.
When there is a high fuel level in the float chamber 3, the float
rises and the needle valve pushes against the valve seat. When
this occurs, no fuel enters the float chamber.
As the fuel level falls the float lowers and the needle valve un-
seats itself; admitting fuel into the float chamber.
In this manner, the needle valve admits and shuts off fuel to
maintain the appropriate fuel level inside the float chamber.