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CARBURETOR IDENTIFICATION
Tecumseh 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.
(diag. 11).
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. (diag. 12).
NOTE: Emissionized carburetors will have a fixed jet.
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. To identify the Series 3 from a Series 4, view the
carburetor from the throttle end. The Series 3 has (1) screw
securing the throttle plate and the Series 4 uses (2) screws.
(diag. 13 - 15)
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. (diag. 16).
NOTE: Emissionized carburetors will have a fixed jet.
14
11
12
13
15
16
11
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