FUEL SYSTEM/CARBURETION
4.13
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 BST 34:
13--14 mm (.51--.55 inches)
2. Measure the height from the float bowl mating
surface to the top of step in float as shown. Both
sidesoffloat shouldbeparalleltoeachother. The
measurementshouldbemadeatthe mid-pointon
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. Besurefloatmeasurementisevenonleft
and right side.
Bend to adjust
float
Float arms even
NEEDLE AND SEAT
LEAKAGE
TEST
1. Install the float bowl. Invert the carburetor and
install a Mity-Vact (PN 2870975) to the fuelinlet
fitting. Apply 5 PSI pressure to inlet fitting. The
needleand seatshouldhold pressureindefinitely.
If not, inspect needle and seat and seat O-ring.
Mity Vact (PN 2870975)
PartShark.com
877-999-5686
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