18
8. Remove all welch plugs if cleaning the carburetor.
Secure the carburetor in a vise equipped with protective
jaws. Use a small chisel sharpened to a 1/8"
(3.175 mm) wide wedge point. Drive the chisel into the
plug to pierce the metal, then push down on the chisel
to pry the plug out of the hole (diag. 35).
NOTE: DO NOT REMOVE ANY BALL OR CUP PLUGS
(diag. 37).
9. Note the direction of the inlet fitting. If necessary the
inlet fitting can be removed. (See page 24).
10. The main nozzle on Series 8 and Series 9 carburetors
can be removed by pressing the tube outward from the
venturi thru the center leg. This nozzle is non-metallic
and has an "O" ring seal on the top and bottom end of
the tube. Do not remove a main nozzle that is made of
brass from any Tecumseh carburetor. These are
pressed in at the factory to a specific depth. When
removing the nozzle, the top "O" ring may not come
out with the tube. The "O" ring must be removed and
placed on the nozzle before it is placed back into the
center leg or it will not seal properly. (diag. 38)
11. Servicing the standard series eleven and bridged
model.
When servicing the series eleven DO NOT soak it in
dipping type carburetor cleaners, use only spray
cleaner or standard solvent tank cleaners. Proper
cleaning requires removal of both welch plugs and
cleaning of the restictor(s) as equipped.
The standard series eleven has one restictor in the
extended prime well as shown (diag. 36). The Bridged
series eleven has an additional restrictor on the idle
leg of the carburetor as shown (diag. 37). Both are
cleaned using spray carburetor cleaner, compressed
air and soft tag wire no larger than .012 inch (.3mm) or
damage will occur.
The main nozzle on some Walbro carburetors are
removable for service. If you remove it, a service nozzle
with the under cut fuel passage must be installed or
problems will occur (diag. 39).
35
ORIGINAL MAIN NOZZLE
DO NOT REUSE
UNDERCUT
ANNULAR
GROVE
39
38
37
"O" RING IN GROOVE
"O" RING
ON TOP OF STEP
(IN GROOVE)
NOT USED ON SERIES 7
OR VECTOR CARBS.
"O" RING
SMALL CHISEL
PRY OUT
PLUG
DO NOT ALLOW
CHISEL POINT
TO STRIKE
CARBURETOR
BODY OR
CHANNEL
REDUCER
SMALL CHISEL
WELCH PLUG TO BE
REMOVED
PIERCE PLUG WITH TIP
ABOUT 1/8"
(3.175 mm)
WIDE
DO NOT REMOVE PLUGS
BALL PLUG
OR RESTRICTOR HOLE
IF BRIDGED SERIES 11
IDLE FUEL PASSAGE
REDUCTION ROD INSIDE
NOT MACHINED ON SERIES 11
BRASS OR BALL PLUG
SERVICE MAIN NOZZLE
REUSABLE
36
WELCH PLUG
EXTENDED
PRIME FUEL
CHAMBER
EXTENTED PRIME
FUEL PASSAGE
(SUPPLIES FUEL
AFTER ENGINE START)
MAIN JET
FUEL INLET
WELCH PLUG
RESTRICTOR
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