How do you adjust a carburetor that is running a rich small engine?
A rich carburetor mixture occurs when too much fuel is mixed with the air that is entering the engine. This can cause the engine to run rough, idle poorly, and produce black smoke from the exhaust. To adjust a carburetor that is running rich, you will need to:
- Identify the carburetor's adjustment screws. Most carburetors have two adjustment screws: an idle mixture screw and a main mixture screw. The idle mixture screw controls the fuel mixture at idle, while the main mixture screw controls the fuel mixture at all other throttle settings.
- Turn the idle mixture screw clockwise to lean out the mixture. This will reduce the amount of fuel that is mixed with the air at idle.
- Turn the main mixture screw clockwise to lean out the mixture at all other throttle settings. This will reduce the amount of fuel that is mixed with the air at all other throttle settings.
- Test the engine after each adjustment to determine if the mixture is correct. The engine should run smoothly and idle correctly with a lean mixture. If the engine is still running rich, you will need to make further adjustments to the carburetor.
FAQ
- What are the symptoms of a rich carburetor mixture? Rough running, poor idling, and black smoke from the exhaust.
- What are the two adjustment screws on a carburetor? Idle mixture screw and main mixture screw.
- Which way do I turn the idle mixture screw to lean out the mixture? Clockwise.
- Which way do I turn the main mixture screw to lean out the mixture? Clockwise.
- How do I know if the carburetor mixture is correct? The engine should run smoothly and idle correctly with a lean mixture.
Related Products
- Briggs & Stratton Carburetor Kit
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- Honda Carburetor Kit
- Kohler Carburetor Kit
- Ryobi Carburetor Kit
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