How do I identify my Tecumseh carburetor? - Tecumseh Carburetor Identification

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  

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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 & 4  

carburetor with a few subtle differences. 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. Aball  

plug is visible from the bottom, which seals the passage.  

This carburetor also has a serviceable main nozzle  

emulsion tube.  

FIXED IDLE  

FIXED MAIN  

HOW TO IDENTIFY A Tecumseh CARBURETOR  

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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 cleand  

with solvent.  

SERIES 6 CARBURETORS-4CYCLE  

Series 6 carburetors are used on 2 and 4-cycle engines.  

They have a larger venturi than the dual system  

carburetor and use a simple fixed idle system. Series 6  

carburetors used on both vertical and horizontal  

applications are nonadjustable. The 4-cycle version  

pictured has a stepped primer bulb.  

HOW TO IDENTIFY A Tecumseh CARBURETOR  

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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 float  

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  

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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 system  

carburetor. It has no adjustments and has a primer assist  

start. It has a noncorrosive float and the needle is viton  

tipped, eliminating the viton seat found in the dual system  

carburetor. The angle of the fuel inlet is adjustable and  

attached to the carburetor body with a banjo bolt. This  

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. These  

carburetors can be operated at a more severe angle  

than float style carburetors. They still require that the  

fuel supply be located in a position that allows it to be  

gravity fed. Its most distinctive feature is the lack of a  

fuel bowl.  

DIAPHRAGM CARBURETORS  

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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 reverse image of the  

WTA Walbro carburetor. It is used on the TC-II. The  

Tillotson HU has a replaceable main and Tillotson is  

visible on the pump cover.  

Tecumseh Power TC CARBURETOR  

This carburetor has a fixed idle and main which meets  

the emissions standards for two cycle engines. The main  

jet is serviceable and can be accessed by removing the  

plastic cap. The jet is removed for cleaning purposes  

only, and must be covered after servicing to maintain  

compliance with emissions regulations.