Onan NHC Series Operator's/Service Manual And Parts Catalog page 101

Carburetor Removal and Disassembly: Remove, and
disassemble the carburetor aissembly as follows,
referring to Figure 13.
1. Remove the fuel line, air cleaner hose, governor
linkage, and choke wires.
2. Remove the two carburetor mounting nuts and
remove the carburetor.
3. Remove the main jet assembly and bowl.
4. Remove the float pin and float.
5. L i f t out the fuel inlet valve and unscrew the valve-
seat. .
6. Remove the idle adjustment needle.
7. Remove the throttle plate screws and the plate,
then pull out the throttle shaft.
8. Remove the choke plate screws and plate,then
pull out the choke shaft.
Carburetor Assembly and Installation: Clean the
components and repair or replace defective or worn
parts. Use acetone or alcohol to dissolve gum deposits
if carburetor cleaner is not effective. Soak the parts
in carburetor cleaner, using it as directed by the manu-
facturer. Clean all carbon from the carburetor bowl,
especially in the area of the throttle plate. Blow out
clogged passages with compressed air. Check the
needles, nozzle, and float for damage or fuel loading.
Check the choke and throttle shafts. Reassemble and
install as follows:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Install the throttle shaft and plate, using new
screws and lock washers. Install with bevel mated
to the carburetor body. If the plate is marked with
the letter C, install it with the mark on the side'
toward the idle port when viewed from the. flange
end of the carburetor. To center the plate, back off
the top screw, close the throttle lever and then
set the plate by tapping it with a small screw-
driver.
Install the choke shaft and plate. Center the plate
in the same manner as the throttle plate, (see step
above). Use new screws and lock washers.
Install the fuel inlet valve seat and valve.
Install the float and float pin, adjusting the float
as previously described.
Install the bowl ring gasket, bowl and bowl nut.
Make sure that the bowl is centered in the gasket
and tighten the main jet assembly securely. Turn
in until it seats and back out to 1-1/2 turns.
Install the idle adjusting screw finger tight. Then
back it out 1 to 1-1/2 turns.
Install the choke and adjust as previously
described.
Install the. carburetor oh the engine and connect
the gasoline inlet, governor mechanism, air cleaner
hose, and choke wires.
Adjust the carburetor needle settings as described
under Adjustments and check out the performance.
I D L E
A D J U S T M E N T N E E D L E —
T H R O T T L E P L A T E
F L O A T
A S S E M B L Y
F U E L B O W L
M A I N J E T
A D J U S T M E N T
F L O A T A X L E
S P R I N G
P O S I T I O N H O O K
U N D E R T A N G O N
F L O A T -
P O S I T I O N O F S P R I N G
A F T E R I N S T A L L A T I O N
FIGURE 13. CARBURETOR ASSEMBLY