FUEL SYSTEM
CARBURETOR
25/30
MODELS
Install the inlet valve assembly and new nozzle
well
gasket.
Install the hinge
pin
and
float.
Install
the intermediate air bleed orifice, the high-
speed orifice, gasket
and
manual primer fuel nip-
ple.
Install
slow-speed needle
and
spring. Turn care-
fully until it lightly contacts seat. Back needle out 2
1/2
turns for initial setting.
Install the carburetor body cover and gasket.
Tighten the screws
in
an
"X" pattern to a torque of
15
to 22
in.
Ibs.
(1.6 to 2.4 N·m).
1. Nozzle well gasket
DR4808
2.
Inlet valve assembly
3.
Hinge pin and float
4. Intermediate air bleed orifice
5. High-speed orifice, gasket and fuel nipple
6. Slow-speed needle and spring
7. Carburetor body cover and gasket
Check for correct positioning of the float level. The
float level controls the height of fuel
in
the float
chamber and
is
critical with regard to carburetor
calibration and function.
Turn carburetor body upside down and
hold so
gasket surface
is
horizontal. The weight of the
float will close the float valve needle. Rest Float
Gauge,
PIN
324891,
on
gasket surface, and slide
gauge up next to float.
Top
of float should be
between notches
float gauge.
158
Use
notch that
is
indicated
"25
thru
75
HP."
Be
certain gauge
is
not holding down the float.
dl
•
\l66
32
4891
o
Float Gauge
93329
If
float level
is
not between the notches of gauge,
lightly bend metal float
arm
to adjust level.
Be
careful not to force float needle valve into seat.
Check for correct
float drop setting. This setting
affects the
full opening of the inlet needle and
is
critical to correct operation of the carburetor.
With carburetor body
in
normal running position,
the
float must drop open from base of carburetor
to
setting shown.
Float Drop Setting - 25/30
1
118
in.
to
1 5/8
in.
(28 to
41
mm)
Bend
float lever tab
to
adjust float drop.
3
4
Float
Drop
Dimension
803406
1. Metal float arm
2. Base
of
carburetor body
3. Float lever tab
4.
Bend dimension
E
o
o
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