How do I identify a Tillotson carburetor?

Typically, Tillotson carburetor model numbers begin with a two-letter designation, such as “HS” or “HU,” followed by a position code, such as “158F” or “7A.” The first section is the carburetor model series and the second number is the specific carburetor designation within that series.

How do you adjust a Tillotson HS carburetor?

How to Adjust a Tillotson Carburetor

1. Locate the idle set screw at the very bottom of the Tillotson carburetor.
2. Find the low-speed adjustment screw with the “L” next to it on the carburetor body.
3. Locate the high-speed adjustment screw with the “H” on the body.
4. Start the motor and let it warm up for a few minutes.

How do I get my Tillotson Carb to idle?

Open the throttle about one quarter of full travel and firmly pull the starting cord until the engine fires. Open the choke shutter far enough to allow the engine to idle until it has warmed up enough to run continuously with the choke fully open.

How do you adjust the float on a Tillotson carburetor?

To adjust the float level, remove the cover to which the needle valve and float assembly are attached. Hold the assembly in an inverted position and bend the float lever arm until the correct setting is obtained. Two points should be considered when checking float level on Tillotson carburetors.

How do you know if your carburetor needs to be rebuilt?

Four Signs Your Carburetor Is Failing

1. Engine Performance Reduction. As mentioned above, combustion starts and keeps your engine running.
2. Black Exhaust Smoke. You shouldn’t see black smoke coming out of your exhaust pipe even if you drive a diesel.
3. Engine Backfires or Overheats.
4. Starting Difficulty.

How do I know what carburetor I need?

The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. Any ordinary stock engine will have a volumetric efficiency of about 80%.