4.10
CARBURATION AND FUEL SYSTEM
© Copyright 2011 Polaris Sales Inc.
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
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.
Pilot Screw
The pilot system supplies fuel during engine operation
with the throttle valve closed or slightly opened. The fuel/
air mixture is metered by pilot screw and discharged into
the main bore through the pilot outlet.
Inlet
Pipe
1
2
3
4
CAUTION
The pilot screw is calibrated at the factory to meet
EPA / CARB regulations for air quality standards and
is sealed with a brass plug to prevent tampering.
Removal of the tamper proof plug is not permitted.
For service purposes, cleaning of the pilot circuit can
be done only by a certified repair shop to ensure air
quality standards are not exceeded.
Pilot Screw Location
Brass Plug Installed
Brass Plug Removed
Содержание 2012 Sportsman Forest 500 International
Страница 1: ...1 GENERAL 2 MAINTENANCE 3 ENGINE 4 FUEL SYSTEMS 5 BODY SUSPENSION...
Страница 2: ...6 CLUTCH 7 FINAL DRIVE 8 TRANSMISSION 9 BRAKES 10 ELECTRICAL...
Страница 3: ...NOTES...
Страница 115: ...NOTES ENGINE 3 60...
Страница 116: ...FUEL SYSTEM 4 1 CHAPTER 4 FUEL SYSTEM 4 CARBURETION SYSTEM 4 3 ELECTRONIC FUEL INJECTION SYSTEM EFI 4 25...
Страница 117: ...4 2 FUEL SYSTEM...
Страница 139: ...NOTES CARBURATION AND FUEL SYSTEM 4 24...
Страница 185: ...NOTES 500 EFI FUEL SYSTEM 4 70...
Страница 212: ...NOTES...
Страница 258: ...NOTES CLUTCHING 6 46...
Страница 330: ...NOTES TRANSMISSION 8 24...
Страница 392: ...10 28 ELECTRICAL 9923412 2012 Sportsman 400 500 and EFI Tractor Service Manual Copyright 2011 Polaris Sales Inc...
Страница 424: ...NOTES ELECTRICAL 10 60...
Страница 425: ...Located By Battery...
Страница 426: ......
Страница 427: ...Located By Transmission Breakout Resistor Module...
Страница 428: ......
Страница 429: ...Located By Battery...
Страница 430: ......
Страница 431: ...Located By Transmission Breakout Resistor Module...
Страница 432: ......