CARBURETOROVERHAUL
Carburetion problems that are not corrected by mix-
ture or float adjustments are usually a result
of
gummed-up fuel passages or worn internal parts. The
most effective solution is a complete carburetor
overhaul.
In general, overhauling a carburetor consists of com-
plete disassembly, a thorough cleaning, and replace-
ment
of
worn parts. Carburetor repair kits are availa-
ble that supply new gaskets and replacements for
those parts most subject to wear.
General instructions for overhauling a carburetorare
given below. Carefully note the position of all parts
while removing to assure correct placement when
reassembling. Read through all the instructions
before beginning for a better understanding of the
procedures involved. Carburetor components are
shown
in
Figures
8
and 8a.
Ignition
of
fuelmight cause serious
personal injury or death by fire or
explosion.
Do
not permit
any
flame, cigareffe, or
other igniter near the fuel system.
Removal and Disassembly
1.
2.
3.
4.
5.
Disconnect all lines, linkages, wires, and attach-
ing nuts or bolts; then, remove the carburetor
from the engine. (Downdraft carburetors may
require removal of the intake manifold to dis-
connect.)
Remove air cleaner adapter, if
so
equipped, and
automatic choking assembly.
Remove throttle and choke plate retaining screws,
then plates.
Pull
out throttle and choke shafts,
being careful not to damage the teflon coating
applied to some throttle shafts.
Remove main and idle mixturescrew assemblies.
On downdraft carburetors, remove attaching
screws and separate upper and lower carburetor
sections. On sidedraft models, unscrew the retain-
ing screw and remove fuel bowl from the upper
carburetor body.
CHOKE
PLATE
B
THROTTLE
-
SHAFT
AND LEVER
THR
T
IDLE ADJUSTMENT
NEEDLE
A
a
THROlTLE PLATE
FIGURE
8.
DOWNDRAFT LUA CARBURETOR ASSEMBLY
Carefully note position
of
float assembly parts,
then slide out retaining pin and remove the float
assembly, any springs or clips, and the needle
valve.
Unscrew and remove needle valve seat.
Cleaning and Repair
1.
2.
3.
Soak all metal components not replaced by repair
kit in carburetor cleaner. Do not soak non-metal
floats or other non-metal parts. Follow the cleaner
manufacturer's recommendations.
Clean all carbon from the carburetor bore, espe-
cially where the throttle and choke plates seat. Be
careful not to plug the idle or main fuel
ports.
Blow out all passages with compressed air. Avoid
using wire or other objects for cleaning that may
increase the size of critical passages.
18
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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