How to Install a 631021B Carb Kit

The 631021B is a carburetor-rebuild kit manufactured for Tecumseh small-gas engines. Tecumseh gas engines are popular four-cylinder engines in lawn mowers and two-cycle engines for trimmers and blowers. The kit, which is made for Tecumseh four-cycle lawn mower engines, includes gasket, needle and seat. Over time Tecumseh carburetors and fuel lines can get clogged up with gunk and impurities from the gasoline. When this happens, it is necessary to clean and rebuild the carburetor with a carburetor kit.

Screwdriver
Drip pan
Putty knife
Spray carburetor cleaner
Wire brush
Carburetor kit

Instructions

- 1
  Set the carburetor on a work bench and use a screwdriver to remove the high-speed needle and seat at the top of the carburetor.
- 2
  Loosen then remove the float bowl on the bottom of the carb with a screwdriver. Allow the excess gasoline inside the float bowl to drain into the drip pan.
- 3
  Scrape the old float-bowl gasket off with a putty knife.
- 4
  Clean the float bowl well with spray carburetor cleaner and a wire brush. Install the new gasket from the kit.
- 5
  Remove the carburetor jets with the screwdriver. Clean the jets and spray out all jet ports on the carburetor with the cleaner.
- 6
  Replace the carburetor jets with the screwdriver.
- 7
  Insert the new seat and high-speed needle from the kit with the screwdriver.

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