Float System - Polaris 2009 Trail Boss 330 Service Manual

FUEL SYSTEM/CARBURETION
4
1
6
7
5
2
3
STARTER SYSTEM (CHOKE
OR ENRICHMENT)
When the choke cable (1) is activated, the starter
plunger (5) is lifted off the seat.
8
7
2
3
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 the main
bore.
4.8
5
1
6
4

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
admit fuel into the chamber. In this manner, the
needle valve admits and shuts off fuel alternately to
maintain a practically constant fuel level inside the
float chamber.
Inlet
Pipe
1
4
3
2