4.7
FUEL SYSTEM / CARBURETION
4
Starter System (Choke or Enrichment)
When the choke cable (1) is activated, the starter plunger (5) is
lifted off the seat.
Fuel is drawn into the starter circuit from the float chamber (2)
through the starter jet (3). Starter jet meters this fuel, which then
flows into starter pipe (4) and mixes with the air (7) coming from
the float chamber. The mixture, rich in fuel content, reaches
starter plunger and mixes again with the air coming through a
passage (8) extending from underneath the diaphragm. The rich
fuel/air mixture for starting is discharged through starter outlet
(6) in the main bore.
Float System
Fuel enters the float chamber (3) by means of the inlet pipe and
passage, through a screen on the back of the inlet needle seat (4),
and around the inlet needle (2). As the fuel fills the float
chamber, the float (1) rises and forces the inlet needle against the
seat, shutting off the orifice in the seat. When fuel level is up in
float chamber, floats are up and needle valve remains pushed up
against valve seat. Under this condition, no fuel enters the float
chamber. As the fuel level falls, floats go down and needle valve
unseats itself to allow fuel into the chamber. In this manner, the
needle valve releases and shuts off fuel alternately to maintain
a constant fuel level inside the float chamber.
1
2
3
4
5
6
7
8
Inlet
Pipe
1
2
3
4
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