How to rebuild a common style Tecumseh style carburetor, common on lawnmowers and generators, as well as many other small Tecumseh engines .Be wise on the note that the premier carburetor, which has the completely round primer ball, is found on the old style Tecumseh engines, “this carburetor does not have the jet screw on the left bottom side by the primer ball, it as well has a metal tube that runs through the center of the carburetor not a black, white, red or blue tube, no o rings are in the metal tube,”. Basically if the carburetor has a metal center tube going through the center of the carburetor then no o rings are inside, so you get to skip this step for the rebuild of this carburetor only, this carburetor only as well as no jet on the left side bottom by the primer ball, remember that the jet is covered by a plastic cap on the most common Tecumseh carburetors. Make sure to clean the gas tank with carburetor cleaner, and the fuel filter screen that is in the gas tank, flush with gas, a new fuel line is recommended. If you notice that your your carburetor is leaking fuel from the fuel filter, or fails to restart easy, or fails to run at a very low rpm then you most likely have not seated the seat in the carburetor correctly, you may have low compression, or the carb was not installed correctly. Remember that the circles on the seat face into the carburetor when being installed, make sure your drill bit is just slightly smaller then the the seat. This method works for the Briggs and Stratton carbs as well.
Be sure to buy good carb cleaner. Good carburetor cleaner will burn your skin, a good way to test carb fluid is to spray a very small amount under your arm, give it a few minutes, If your skin swells up and is bright red then you know you got a good product. If your skin does not get red and irritated, repeat the process with other brands of carburetor cleaner until you find one that burns really good. Trust me carb cleaner is not all the same, You do not always get what you pay for with this stuff. You can effectively test the products in the store using this method.