Carburetor Inspection; Float Height Adjustment; Needle And Seat Leakage Test - Polaris Ranger 500 2x4 2007 Service Manual

CARBURETION SYSTEM

Carburetor Inspection

1. Inspect the inlet needle tapered surface for any sign of
wear or damage. Be sure the spring loaded pin is free
moving and returns freely when pushed. The inlet needle
and seat should be pressure tested after assembly.
Good Condition
Seat
Needle

Float Height Adjustment

1. Place the carburetor on a level surface as shown at right to
remove weight from float arm. In this position, the float
tongue will rest lightly on the inlet needle valve pin
without compressing the spring.
Float Height:
Std: BST 34 13 - 14 mm (.51 - .55 inches)
4.12
Worn, Deposits
Wear areas
2. Measure the height from the float bowl mating surface to
the top of step in float as shown. Both sides of float should
be parallel to each other. The measurement should be made
at the mid-point on the top of the 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.
3. If adjustment is necessary, bend the tongue slightly. Be sure
float measurement is even on left and right side.
Float Arms Even
Bend to Adjust Float

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™ (PN 2870975)