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FUEL SYSTEM/CARBURETION
4.14
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:
Sportsman 400 -- BST 34 -- 13.0mm
(.51″) ± 1mm
Sportsman 500 -- BST 40 -- 14.7mm
(.58″) ± 1mm
NOTE: On BST 40 carburetors, it is important to
press in on the float assembly as shown, to fully seat
the float assembly.
BST 40
BST 34
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 parallelto 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 iseven on left
and right side.