How do I adjust the carburetor on my lawn mower?

Set the throttle to fast and start the mower engine. Turn the high speed screw first clockwise until the engine slows, then counterclockwise until it slows. Locate the center point where the engine idles best. Move the throttle from slow to fast then back to slow to test the adjustment.

How do you adjust a carburetor on a small engine?

Turn the high speed or main jet screw clockwise until the engine begins to slow. Then, turn the screw the other way until the engine begins to slow. Turn the screw back to the midpoint. Once adjusted, check engine acceleration by moving the throttle from idle to fast.

Why does my lawnmower backfire when starting?

A spark plug that is damaged, worn, or has an improperly set gap between its electrodes creates a weak spark. As a result, the fuel may not ignite in the cylinder, but it might ignite when it reaches the hot exhaust muffler. The result is a loud backfire. Poor spark also results in a mower that runs unreliably.

How do you adjust a rich carburetor?

Regardless of whether or not the engine is running too rich or too lean, bring it down to a very lean mixture by turning both screws a quarter-turn at a time, counter-clockwise, then slowly bringing them back up to an equal and smooth mixture.

How to Adjust the Carburetor on a Small Two-Stroke Engine. Locate the two adjustment screws on the carburetor. One screw is for the idle speed or low speed; the other is for the high speed. Turn both of the screws counterclockwise to back them out. This will set them in the “open” position.

How do you fix a lawn mower carburetor?

Use a socket wrench to remove the bolt that secures the carburetor to the lawn mower. Pull the carburetor off of the throttle linkage and away from the mower. Hold the carburetor with one hand and spray it with carburetor cleaner, keeping the spray nozzle away from you while spraying.

How can the carburetor be adjusted on a Tecumseh engine?

Step 1 Locate the adjustment screw on your Tecumseh engine. It should be on the side of the barrel of your carburetor. Turn the adjustment screw clockwise until the needle valve is closed and seated at the bottom. Make sure you do not overtighten or you will damage the valve. Turn the adjustment screw counterclockwise 1 1/2 turns.