How to adjust poulan chainsaw carburetor?

How to adjust poulan chainsaw carburetor?


Adjusting the carburetor of a Poulan chainsaw is an essential task that can help optimize its performance and ensure smooth operation. The carburetor is responsible for mixing fuel and air in the correct proportion before it enters the engine. Over time, the carburetor may require adjustment due to factors like changes in altitude, fuel quality, or wear and tear. In this article, we will explore the step-by-step process of adjusting the carburetor on a Poulan chainsaw to help you maintain its optimal performance.

Step 1: Safety Precautions

Before starting any maintenance work on your chainsaw, it is crucial to prioritize safety. Make sure you are wearing appropriate protective gear, including safety glasses, gloves, and hearing protection. Ensure the chainsaw is turned off and the spark plug is disconnected to avoid accidental starts. Additionally, work in a well-ventilated area to prevent exposure to harmful exhaust fumes.

Step 2: Locate the Carburetor Adjusting Screws

To adjust the carburetor, you need to locate the adjusting screws. On most Poulan chainsaws, you will find three screws labeled “H,” “L,” and “T.” The “H” screw controls the high-speed fuel mixture, the “L” screw controls the low-speed fuel mixture, and the “T” screw is used for idle speed adjustment.

Step 3: Initial Settings

Before making any adjustments, it is essential to know the initial settings recommended by the manufacturer. These settings can be found in the chainsaw’s user manual or on the manufacturer’s website. Start by gently turning the “H” and “L” screws clockwise until they are fully closed (but not too tight) to find the initial positions.

Step 4: Adjusting the Low-Speed Mixture

To adjust the low-speed mixture, start by turning the “L” screw counterclockwise until it stops. Then, turn it back about 1.5 turns. This is a general starting point, and fine-tuning may be required based on the specific model and conditions.

Step 5: Adjusting the High-Speed Mixture

To adjust the high-speed mixture, start the chainsaw and let it warm up for a few minutes. Once warmed up, hold the throttle at full speed and turn the “H” screw counterclockwise until the engine starts to run unevenly or “lean.” Then, slowly turn the screw clockwise until the engine runs smoothly and reaches its maximum RPM. Fine-tune the adjustment by making small adjustments in either direction until the chainsaw performs optimally.

Step 6: Idle Speed Adjustment

To adjust the idle speed, locate the “T” screw. Start by turning the screw counterclockwise until the chain stops moving. Then, turn it clockwise just enough to keep the chain stationary. The idle speed should be set at a level where the engine runs smoothly without engaging the chain.

Step 7: Testing and Fine-Tuning

After adjusting the carburetor, it is essential to test the chainsaw’s performance. Start the chainsaw and let it idle for a few seconds. Then, rev the engine and observe its response. If the engine hesitates or stalls, it may indicate that further adjustments are required. Fine-tune the “L” and “H” screws in small increments until the chainsaw runs smoothly throughout its operating range.


Adjusting the carburetor of a Poulan chainsaw is a task that can significantly impact its performance. By following the step-by-step process outlined in this article, you can ensure that your chainsaw operates optimally and efficiently. Regularly checking and adjusting the carburetor can help maintain the chainsaw’s power, fuel efficiency, and overall longevity.


– Poulan Pro:
– Poulan Chainsaw User Manual: