HOW TO IDENTIFY A Tecumseh Power CARBURETOR
Tecumseh Power has a variety of carburetors. To help identify these carburetors here are some simple procedures to
follow.
DUAL SYSTEM CARBURETORS
The easiest way to identify the dual system carburetor is
by the presence of a large primer bulb located on the
side of the carburetor. The absence of adjustment
needles help to identify the carb as well. The dual
system carburetor is used on 4-cycle vertical crankshaft
rotary mower engines.
SERIES 1 CARBURETORS
Series 1 carburetors come in a variety of styles. They
are used on both 2 and 4-cycle vertical and horizontal
shaft engines in the 2 through 7 h.p. range. It is a float
style carburetor with a smaller venturi than the Series 3
and 4 carburetors. Some will have an adjustable idle
and main and others will have a fixed main with an
adjustable idle. There are also some fixed speed
applications that will only have a fixed main system and
the idle system will not be drilled.
SERIES 1 EMISSION
This carburetor is similar to the standard Series 1
carburetor. The emission equivalent has a fixed idle and
main. The idle restrictor jet will be capped to prevent
access unless the cap is removed. The fixed main jet is
part of the bowl nut. A ball plug is visible from the bottom,
which seals the passage. This carburetor also has a
serviceable main nozzle emulsion tube.
5
HOW TO IDENTIFY A Tecumseh CARBURETOR
(CONTINUED)
SERIES 2 CARBURETORS
Series 2 carburetors were used on outboard engines.
This carburetor is the same as the Series 1 with the
exception of the remote adjustable idle mixture screw,
and a built in fuel pump.
Series 2 carburetors have a built-in fuel pump consisting
of a fuel pump element which inflates and deflates with
crankcase pulsations which opens and closes two flap
valves in the fuel pump, thereby pumping fuel from a
remote tank to the carburetor float bowl.
When replacing the fuel pump element, install with the
o
slot opening at a 45 angle as illustrated. Installation in
any other position will damage the diaphragm.
SERIES 3 & SERIES 4 CARBURETORS
Series 3 and 4 carburetors are generally used on 8
through 12.5 horsepower 4-cycle engines. The venturi
size of these carburetors are larger than Series 1 and
Dual System Carburetors. The quickest way to identify
these carburetors is by the presence of bosses on each
side of the idle mixture screw.
SERIES 3 & SERIES 4 EMISSION
This carburetor is similar to the standard Series 3 &
carburetor with a few subtle differences. The emissio
equivalent has a fixed idle and main. The idle restrict
jet will be capped to prevent access unless the cap
removed. The fixed main jet is part of the bowl nut. Ab
plug is visible from the bottom, which seals the passag
This carburetor also has a serviceable main nozz
emulsion tube.
FIXED IDLE
FIXED MAIN
HOW TO IDENTIFY A Tecumseh CARBURETOR
(CONTINUED)
To determine whether the carburetor is a Series 3 or
Series 4, look at the throttle or choke end of the
carburetor.
Series 3 will have one screw on the throttle and choke
plates.
The Series 4 will have two screws on the throttle and
choke plates.
SERIES 3
SERIES 4
VECTOR CARBURETORS
The Vector carburetor is a float feed, nonadjustable
carburetor, with a one piece extruded aluminum body.
The float bowl, float, nozzle, and venturi are nonmetallic,
which eliminates the corrosion and varnishing problems
associated with similar metallic parts. Common service
areas of the carburetor are contained in the fuel bowl,
which include the float, needle, seat and main nozzle
emulsion tube. All of these parts can be serviced without
removing the carburetor body from the engine.
NOTE
If the unit was run with poor filter maintenance the
venturi should be removed and the air bleeds clean
with solvent.
SERIES 6 CARBURETORS-4CYCLE
Series 6 carburetors are used on 2 and 4-cycle engine
They have a larger venturi than the dual syste
carburetor and use a simple fixed idle system. Series
carburetors used on both vertical and horizont
applications are nonadjustable. The 4-cycle versio
pictured has a stepped primer bulb.
HOW TO IDENTIFY A Tecumseh CARBURETOR
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CONTINUED)
SERIES 6 CARBURETORS - 2-CYCLE
Series 6 carburetors used on TVS/TVXL840 engines
are similar in appearance and operation to the
carburetors used on 4-cycle engines with the following
differences:
1
. The bowl nut is left-hand thread. This bowl nut
is identified by an "L" stamped on the nut and
the international left thread notches across the
points.
2. A dampening spring is installed on the floa
hinge pin to reduce erratic float travel.
3. The two mounting bosses extend out from the
carburetor body.
CUTLINE
SERIES 7 CARBURETORS (EMISSION)
The Series 7 carburetor is an emissions grade
carburetor used on medium frame vertical shaft
overhead valve engines. It has a non-metallic bowl and
a snap-on bowl retainer to connect it to the carburetor
body. This model has a fixed main jet and a fixed idle jet;
both are located in the carburetor bowl. The float bowl,
float, nozzle, and venturi are non-metallic, which
eliminates the corrosion and varnishing problems
associated with similar metallic parts. Common service
areas of the carburetor are contained in the fuel bowl,
which include the float, needle, seat and main nozzle
emulsion tube. All of these parts can be serviced without
removing the carburetor body from the engine.
SERIES 8 CARBURETOR (EMISSION)
The Series 8 carburetor has both a fixed main and idle
circuit. The fixed idle system is achieved by a restrictor
jet that meters the fuel for the idle circuit. The idle
restrictor jet will be capped to prevent access unless the
cap is removed. The fixed main jet is part of the bowl
nut. A ball plug is visible from the bottom, which seals
the passage. This carburetor also has a serviceable
main nozzle emulsion tube. It also has a stepped primer
bulb.
HOW TO IDENTIFY A Tecumseh CARBURETOR
(CONTINUED)
SERIES 9 CARBURETOR
The Series 9 carburetor is an emissions carburetor that
uses the same carburetor body as the Series 8 but with a
simple fixed idle system, identical to the one used on the
Series 6 carburetor. It has the idle discharge port located
at the 7 o'clock position on the throttle end of the
carburetor. Identify this carburetor by the stepped primer
bulb, the presence of a non-drilled idle mixing well and a
serviceable main nozzle emulsiontube.
SERIES 10 (EMISSION)
The Series 10 carburetor is identical to the Series 8
carburetor with the addition of a choke. To assist in cold
weather starts. It has a fixed idle and main. The idle
restrictor jet will be capped to prevent access unless the
cap is removed. The fixed main jet is part of the bowl nut.
A ball plug is visible from the bottom, which seals the
passage. This carburetor also has a serviceable main
nozzle emulsion tube. It also has a stepped primer bulb
to assist in starting.
SERIES 11
This carburetor adds a fuel chamber, built into the
carburetor body, that feeds fuel into the venturi during
the initial warm up period. This patented feature
eliminates, hunting, surging and false starts inherent to
emissions engines. However external identification of
the Series “11” carburetor has been a challenge. To
make this ID simple, the Series “11” carburetor idle
restrictor cap will be black, and all others will be gray. The
part number for the black cap is 640200 and the gray is
640053.
SERIES 11 BRIDGED
CAPPED JET
This carburetor is identical to the Series “11” with the
exception of the center leg. Anon-metallic jet is pressed
into the center leg to allow additional fuel into the main jet
for applications that require this fuel to enhance run
performance
NON-METALLIC JET
CARBURETOR CLEANING - SERIES 11 and SERIES
11 BRIDGED
With the additional fuel well welch plug removed, you
can see the small plastic metering jet, which can be
distorted if left to soak in a carb dip tank. Currently, this
metering jet is not a serviceable part. Our position has
been to soak a carburetor no more than ½ hour but the
exception is the Series 11 carburetor. To be safe, service
all Tecumseh carburetors with Carburetor Spray
BRIDGED
SERIES 11
STANDARD 11
#
696410 along with a .012” (.304mm) gauge wire.
NON-Tecumseh CARBURETORS
DELLORTO CARBURETOR
The Dellorto carburetor is similar to the dual syste
carburetor. It has no adjustments and has a primer assi
start. It has a noncorrosive float and the needle is vito
tipped, eliminating the viton seat found in the dual syste
carburetor. The angle of the fuel inlet is adjustable an
attached to the carburetor body with a banjo bolt. Th
carburetor is used on some TVS rotary lawn mower
engines.
WALBRO LMK CARBURETOR
The Walbro LMK has a large venturi and a fixed main with
an adjustable idle. It is used on some OHV engines. This
carburetor has a non-corrosive float and a viton tipped
needle. It also has a non-metallic choke shaft. It is easily
identified by the Walbro name on the carburetor body
next to the idle adjustment screw.
WALBRO WHG CARBURETOR
The WHG, used on OH cast iron engines, can be built as a
fully adjustable, single adjust or non-adjustable
carburetor. It has a large venturi. Its most recognizable
feature is the large square mounting surface on the choke
end of the carburetor.
DIAPHRAGM CARBURETORS
DIAPHRAGM CARBURETORS
The diaphragm carburetors are unique. The
carburetors can be operated at a more severe ang
than float style carburetors. They still require that t
fuel supply be located in a position that allows it to
gravity fed. Its most distinctive feature is the lack o
fuel bowl.
DIAPHRAGM CARBURETORS
(CONTINUED)
WTA WALBRO CARBURETOR
The WTA carburetor has a rubber-type diaphragm,
which is exposed to intake pressure on one side and to
atmospheric pressure on the other. The WTA is used on
TC200 and 300 engines. There are two adjustment
screws. They are the idle mixture screw and the idle
RPM screw. The WTA has a choke and an all metal fuel
inlet fitting. The Walbro name is molded onto the pump
cover.
WT WALBRO CARBURETOR
The WT Walbro carburetor is used on the TC-II style
engine. It is similar to the WTAcarburetor but its reverse
image. The WT has no choke lever and has a
combination plastic and metal fuel inlet fitting.
TILLOTSON HU CARBURETOR
The Tillotson HU carburetor is the revers
WTA Walbro carburetor. It is used on t
Tillotson HU has a replaceable main a
visible on the pump cover.
Tecumseh Power TC CARBURETOR
This carburetor has a fixed idle and main
the emissions standards for two cycle eng
jet is serviceable and can be accessed by
plastic cap. The jet is removed for clea
only, and must be covered after servicin
compliance with emissions regulations.
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