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