Float Height Adjustment; Needle And Seat Leakage Test - Polaris 2007 Sportsman 500 EF Service Manual

CARBURETOR - SPORTSMAN 450
the engine running. Refer to Page 2.10.
Pilot Screw Base Setting
(Set at Factory)
Factory Specification: 2.5 Turns Out

Float Height Adjustment

1. Illustration 1: Place the throttle side of the carburetor on
a level surface to remove weight from float arm. In this
position, the float tongue will rest slightly outward.
2. Illustration 2: With the carburetor still resting on the level
surface, use one hand to slightly tilt the carburetor back.
The float will then fall into the correct position, with the
float tongue resting lightly on the inlet needle valve pin
without compressing the spring. The bottom of the float
should be parallel with the float bowl mating surface.
Illustration 3: NOTE: If the float is past parallel with the
mating surface, the carburetor has been tilted back too far
and the float tongue is likely compressing the needle valve
pin.
3. Measure the height from the float bowl mating surface to
the top of step of the float as shown in Illustration 2. Both
sides of float should be parallel to each other. The
measurement should be made at the mid–point on top of the
4.42
Float parallel with float
bowl mating surface
float using Float Adjustment Tool (PN 2872314) or a
vernier caliper. When measuring the height, be sure the
inlet needle valve spring is not compressed.
Float Bowl Height: 13-14 mm
4. If adjustment is necessary, bend the tongue slightly. Be sure
float measurement is even on left and right side.

Needle and Seat Leakage Test

1. Install the float bowl. Invert the carburetor and install a
Mity–Vac™ (PN 2870975) to the fuel inlet fitting. Apply
5 PSI pressure to inlet fitting. The needle and seat should
hold pressure indefinitely. If not, inspect needle and seat
and seat O–ring.
Mity Vac
TM
(PN 2870975)