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Snowmobile Polaris EDGE / WIDETRAK (2007-2012 year). Manual - part 24

4.10

Fuel System

9923396 - 2007-2012 EDGE/Widetrak LX Service Manual

Inspect e-rings, plate, spring, and rings (14)
connecting the slide to the lever if needed.

10. Remove water trap/drain plug (15) and single screw

(16) on the bottom of the carburetor.

11. Remove and drain the float bowl (17).

NOTE: Float bowl will not come off unless the water
trap/drain plug and screw are removed.

12. Remove the two screws (18) holding the float/needle

and seat assembly (19) in position and remove this
assembly.

13. Inspect the contents for wear and debris.

14. Remove and inspect the main jet (20), pilot jet (21),

and starter jet (22). Clean them out.

15. Remove the air jet screw if so equipped.

16. Clean out all passages in carburetor body with

carburetor cleaner. Dry all passages and jets with
compressed air.

17. Replace gaskets and any parts that show wear or

damage.

18. Repeat steps 1-18 for disassembly for the other

carburetor if needed.

4.11

Fuel System

9923396 - 2007-2012 EDGE/Widetrak LX Service Manual

Assembly

Install the main jet (20), pilot jet (21), and starter jet
(22).

Install float/needle & seat assembly (19).

Place carburetor in an inverted position.

Connect a pressure tester (PN 2870975) to fuel inlet
fitting. Apply 5 psi pressure and observe for one
minute. The needle and seat should hold pressure
indefinitely. If the pressure drops, carefully inspect the
needle and the needle seat. The needle can be
replaced (needle supplied with float and seat).

Carefully inspect float bowl gasket and replace if
necessary.

Install float bowl (16) on carburetor with water trap/
drain plug (15) and single screw (16) on the bottom of
the carburetor.

If throttle slide was removed, install throttle slide (11)
so that the wider face is facing the engine side of the
carburetor.

Install the funnel gasket (13) and funnel (12) onto the
carburetor. You will have to lift the throttle slide up and
place the smaller face into the funnel area.

Install funnel screws (10).

10. Install the e-clip (8) in the desired position on the jet

needle (7).

11. Slide the plastic washer (9) on the jet needle so that

it is positioned to rest on top of the throttle valve when
assembled.

12. Install carburetors on engine.

13. Replace top cap gaskets (3), cover (2) and screws (1).

14. Check throttle lever free play.

4.12

Fuel System

9923396 - 2007-2012 EDGE/Widetrak LX Service Manual

MIKUNI TM CARBURETOR
ADJUSTMENT

Throttle Valve Synchronization

All throttle valve synchronization adjustments are made to
the MAG throttle valve. The PTO throttle valve is non-
adjustable and considered the base throttle valve.

Throttle valve synchronization can be performed with the
carburetor rack installed or removed from the engine.

If running, turn off engine. Remove the air box.

Remove the carburetor covers.

Hold the throttle bell crank wide open on the
carburetor.

The bottoms of each throttle valve should be flush with
the top of the intake bores.

If adjustment is required, hold the PTO carburetor
flush with the top of intake bore. Turn the throttle stop
screw in or out to set the PTO throttle slide flush with
the intake bore.

Once the PTO carburetor slide is flush, loosen the
Phillips head screw, located under the top cover on
the MAG carburetor.

While holding the PTO carburetor slide flush to the top
of the carburetor, rotate the synchronization nut
clockwise to raise the slide and counterclockwise to
lower the slide.

Adjust the synchronization nut until it is even with the
PTO slide.

Once this is flush, lock the locking screw.

10. Replace the carburetor covers.

11. If removed, reinstall the fuel, vent, throttle, and choke

hose and cable connections.

12. Verify and set throttle cable free play.

Lock Screw

Sync Nut

4.13

Fuel System

9923396 - 2007-2012 EDGE/Widetrak LX Service Manual

FUEL PUMP

Operation

The fuel pump works by using the positive (pressure) and
negative (vacuum) impulses generated by the upward and
downward movements of the pistons to supply each
carburetor with fuel.

When the piston is on the downward stroke, positive
pressure is applied to the fuel pump diaphragm. The
pressure pushes fuel out to the carburetors. A check valve
prevents fuel from being pushed into the fuel tank during
this cycle.

When the piston in on the upward stroke, negative
pressure (vacuum) is applied to the diaphragm. This
draws fuel into the fuel pump from the fuel tank. A check
valve prevents fuel from being drawn out of the
carburetors during this cycle.

To check the fuel pump operation, disconnect one of the
carburetor fuel supply hoses and place into an appropriate
container. A steady flow of fuel should flow from the hose
when the engine is at idle speed.

To inspect the diaphragm, connect a Mity Vac hand
pressure pump to the impulse fitting. Apply 4 - 6 PSI. The
diaphragm should hold the pressure indefinitely.

Replace cracked, bent or broken check valve flaps, and
gaskets when found.

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