How To Set Carburetor On Poulan Chainsaw Easy Steps

Yes, you can set the carburetor on your Poulan chainsaw by following a few straightforward steps. Adjusting your Poulan chainsaw carburetor properly is key to ensuring it runs smoothly and efficiently. If your Poulan chainsaw is sputtering, running rough, or has no power, a carburetor adjustment or cleaning might be all it needs. This guide will walk you through the process of tuning your Poulan chainsaw carburetor, including how to handle common issues like adjusting the Poulan chainsaw idle speed and locating the Poulan chainsaw mixture screws. We’ll also touch on when a Poulan chainsaw carb rebuild or Poulan chainsaw carburetor cleaning might be necessary to get your Poulan chainsaw fuel mixture just right.

Why Your Poulan Chainsaw Needs Regular Carburetor Care

A chainsaw’s carburetor is like its engine’s fuel pump and mixer. It takes the gasoline and oil mixture and breaks it down into a fine spray that mixes with air before entering the engine’s cylinders. This air-fuel mixture is what powers your chainsaw. If this mixture is off, your chainsaw won’t run as it should.

Common problems that point to carburetor issues include:

Poulan chainsaw sputtering: This usually means the engine is getting too much fuel.
Poulan chainsaw running rough: This can be caused by too much or too little fuel, or even debris in the carburetor.
Poulan chainsaw no power: A lean fuel mixture (too much air, not enough fuel) or a clogged carburetor can rob your saw of its power.
Difficulty starting: An improperly adjusted carburetor can make it hard to get your saw going.
Engine dies when throttle is released: This is often a sign of an improperly set idle speed.

Regular maintenance, including checking and adjusting the carburetor, can prevent these issues and extend the life of your Poulan chainsaw.

Identifying Your Poulan Chainsaw Carburetor

Before you start adjusting, you need to find the carburetor. On most Poulan chainsaws, the carburetor is a small, metal or plastic component located beneath the air filter cover. You’ll usually remove a few screws or a latch to access the air filter, and behind that, you’ll see the carburetor.

Your Poulan chainsaw carburetor will have:

Fuel lines: These connect the fuel tank to the carburetor.
Air intake: This is where air enters the carburetor.
Adjustment screws: These are the key to tuning your carburetor. You’ll typically find one or two, sometimes three, on the body of the carburetor.

Locating the Poulan Chainsaw Mixture Screws

The Poulan chainsaw mixture screws are the primary tools for tuning your carburetor. These screws control the ratio of fuel to air entering the engine. There are usually two main screws, often labeled “H” (high speed) and “L” (low speed). Some carburetors might also have a third screw, sometimes labeled “T” (idle speed adjustment), though this is often a separate knob or screw that controls the throttle linkage.

The “L” Screw: This screw adjusts the fuel mixture at idle and low engine speeds.
The “H” Screw: This screw adjusts the fuel mixture at high engine speeds, when you’re cutting.
The Idle Speed Screw (or Throttle Stop Screw): This screw doesn’t adjust the fuel mixture directly. Instead, it controls how far the throttle plate opens at idle, thus setting the idle speed.

Important Note: The exact location and appearance of these screws can vary slightly between different Poulan chainsaw models. Always consult your owner’s manual if you’re unsure.

Gathering the Right Tools for the Job

To properly adjust your Poulan chainsaw carburetor, you’ll need a few basic tools:

Screwdriver Set: You’ll need a flathead screwdriver that fits your Poulan chainsaw mixture screws snugly. Some screws might require a specific size, while others might use a common screwdriver.
Tachometer (Optional but Recommended): A tachometer allows you to measure the engine’s RPM (revolutions per minute) accurately, which is crucial for precise idle speed adjustments. You can find inexpensive digital tachometers designed for small engines.
Gloves: To keep your hands clean.
Safety Glasses: Always protect your eyes.
Rags: For cleaning up any fuel spills.

Steps for Setting Your Poulan Chainsaw Carburetor

Here’s a step-by-step guide to help you with the Poulan chainsaw carburetor adjustment:

Step 1: Prepare Your Chainsaw

Ensure a Full Fuel Tank: Make sure your Poulan chainsaw has a fresh mixture of gasoline and oil.
Clean the Air Filter: A clogged air filter can mimic carburetor problems. Remove and clean or replace your air filter before you start. A dirty air filter restricts airflow, making the fuel mixture too rich.
Locate the Carburetor: As mentioned earlier, find the carburetor under the air filter cover.
Identify the Screws: Locate the “L,” “H,” and idle speed screws.

Step 2: Initial Carburetor Screw Settings (Resetting)

This step is a good starting point if you’re unsure of the current settings or if your carburetor has been serviced.

Gently Turn Screws In: With the engine off and cold, gently turn the “L” and “H” screws clockwise until they lightly seat. Do not overtighten, as this can damage the carburetor.
Back Out Screws: Turn both the “L” and “H” screws counter-clockwise:
- “L” Screw: Back it out 1.5 to 1.75 turns.
- “H” Screw: Back it out 1.5 to 1.75 turns.
- These are general starting points. Your specific Poulan chainsaw model might have slightly different recommended settings in its manual.

Step 3: Adjusting the Idle Speed (Poulan Chainsaw Idle Speed Adjustment)

This is often the first adjustment to make.

Start the Engine: With the chain brake engaged, start your Poulan chainsaw. Let it warm up for a minute or two.
Locate the Idle Speed Screw: This screw typically controls the throttle linkage. It might be a plastic knob or a screw that pushes against the throttle lever.
Adjust for Correct Idle:
- If the engine dies when you release the throttle, you need to increase the idle speed. Turn the idle speed screw clockwise slightly to open the throttle a bit more.
- If the chain spins while the throttle is released (this is dangerous!), you need to decrease the idle speed. Turn the idle speed screw counter-clockwise to close the throttle slightly.
- The goal is a steady idle without the chain moving. Consult your manual for the recommended idle RPM.

Step 4: Adjusting the Low-Speed Mixture (“L” Screw)

This adjustment affects how your chainsaw behaves when you first engage the throttle.

Engine Should Be Warm: Ensure the engine is at operating temperature.
Turn “L” Screw In/Out:
- Start with the “L” screw at its initial setting (e.g., 1.5 turns out).
- Slowly turn the “L” screw clockwise (leaner mixture) or counter-clockwise (richer mixture) in small increments (about 1/8 of a turn at a time).
- Listen to the engine. You’re looking for the point where the engine runs smoothest at idle.
Test Throttle Response:
- Briefly squeeze and release the throttle. The engine should accelerate smoothly without bogging down or hesitating.
- If it bogs down when you accelerate, the low-speed mixture is likely too lean (turn the “L” screw slightly counter-clockwise).
- If it hesitates or sputters when you accelerate, the low-speed mixture is likely too rich (turn the “L” screw slightly clockwise).
Fine-tune the Idle: After adjusting the “L” screw, you may need to re-adjust the idle speed screw to maintain a steady idle.

Step 5: Adjusting the High-Speed Mixture (“H” Screw)

This adjustment affects performance under load, such as when cutting wood.

Engine at Operating Temperature: Make sure the engine is fully warmed up.
Test Under Load (Safely):
- With the chain brake off and the saw in a safe cutting position (on the ground, not in the air), briefly apply full throttle.
- Listen to the engine sound.
Adjust “H” Screw:
- If the engine sounds like it’s “four-stroking” or “chugging” at full throttle, the high-speed mixture is too rich (turn the “H” screw slightly clockwise).
- If the engine sounds like it’s “screaming” or “lacking power” at full throttle, the high-speed mixture is too lean (turn the “H” screw slightly counter-clockwise).
- Crucially, avoid running the engine too lean for extended periods. A lean condition can cause the engine to overheat and seize.
Find the Sweet Spot: You’re looking for a point where the engine revs up cleanly and has good power without sounding like it’s struggling or about to seize.

Table: Carburetor Adjustment Symptoms and Solutions

Symptom	Likely Cause	Adjustment
Poulan chainsaw sputtering at idle	Rich low-speed mixture	Turn “L” screw clockwise (leaner)
Hesitation on acceleration	Lean low-speed mixture	Turn “L” screw counter-clockwise (richer)
Engine dies when throttle released	Idle speed too low	Turn idle speed screw clockwise
Chain spins at idle	Idle speed too high	Turn idle speed screw counter-clockwise
Poulan chainsaw no power at full throttle	Lean high-speed mixture	Turn “H” screw counter-clockwise (richer)
Engine “four-strokes” at full throttle	Rich high-speed mixture	Turn “H” screw clockwise (leaner)
Poulan chainsaw running rough	Incorrect adjustment of “L” or “H” screws	Re-adjust both screws

Step 6: Final Checks and Refinements

Re-check Idle: After adjusting the “H” screw, the idle speed might change. Re-adjust the idle speed screw if necessary.
Test Acceleration Again: Ensure smooth transition from idle to full throttle.
Test Cutting: If possible, test the saw under a light load to see how it performs.

When Cleaning or Rebuilding is Necessary

If you’ve followed these steps and your Poulan chainsaw is still Poulan chainsaw sputtering, Poulan chainsaw running rough, or has Poulan chainsaw no power, it might be time for a more in-depth service.

Poulan Chainsaw Carburetor Cleaning

Over time, varnish and debris can build up inside the carburetor, restricting fuel flow.

Signs you need to clean your carburetor:

The saw only runs with the choke on.
The saw runs but is weak or stalls easily.
You can’t get it to run correctly even after adjusting the screws.
You notice fuel stains or residue around the carburetor.

How to Clean:

Remove the Carburetor: Carefully disconnect fuel lines and any linkage. Note the position of each part.
Disassemble: Lay out the parts on a clean surface. Most carburetors can be disassembled by removing the float bowl (if present) and then the internal components.
Clean with Carburetor Cleaner: Use a specialized carburetor cleaner spray. Spray into all the jets, passages, and openings. Use compressed air to blow out any residual cleaner or debris. A thin wire or a small drill bit can gently be used to clear stubborn jets, but be extremely careful not to enlarge them.
Reassemble: Put the carburetor back together, ensuring all gaskets and diaphragms are in good condition. If any parts are damaged, you might need a Poulan chainsaw carb rebuild kit.

Poulan Chainsaw Carb Rebuild

A rebuild involves replacing worn-out parts like diaphragms, gaskets, and needle valves.

Signs you need a rebuild:

The carburetor is severely corroded or damaged.
You’ve cleaned it thoroughly, but it still doesn’t function correctly.
The Poulan chainsaw fuel mixture seems consistently off, no matter the adjustment.
The saw is leaking fuel.

How to Rebuild:

Purchase a Rebuild Kit: Ensure you get the correct kit for your specific Poulan chainsaw carburetor model.
Disassemble Carefully: Follow the instructions that come with the kit. Take pictures as you go to remember how it all fits together.
Replace Parts: Replace all the diaphragms, gaskets, and any other components specified in the kit. Pay close attention to the orientation of diaphragms.
Reassemble: Carefully put the carburetor back together.
Re-adjust: After a rebuild, you will definitely need to perform the carburetor adjustment steps outlined earlier.

Frequently Asked Questions (FAQ)

Q1: How do I know if my Poulan chainsaw carburetor needs adjustment?
A1: If your Poulan chainsaw is sputtering, running rough, has no power, hesitates when you accelerate, or stalls easily, the carburetor likely needs adjustment.

Q2: What are the Poulan chainsaw mixture screws for?
A2: The Poulan chainsaw mixture screws, typically labeled “L” (low speed) and “H” (high speed), control the amount of fuel mixed with air for optimal engine performance at different throttle settings.

Q3: Can I adjust the carburetor without a tachometer?
A3: Yes, you can adjust the carburetor by listening to the engine’s sound and observing its performance. However, a tachometer helps achieve precise settings, especially for the idle speed.

Q4: What happens if I set the Poulan chainsaw fuel mixture too lean?
A4: Setting the fuel mixture too lean (too much air, not enough fuel) can cause the engine to run hot, lose power, and potentially seize or suffer catastrophic damage. Always err on the side of slightly rich if unsure.

Q5: My Poulan chainsaw is running rough, and I can’t figure out why. What should I check first?
A5: Start with the basics: ensure you have fresh fuel, the air filter is clean, the spark plug is in good condition, and the muffler is clear. If these are fine, then focus on the carburetor adjustment and cleaning.

Q6: How often should I clean my Poulan chainsaw carburetor?
A6: It’s a good idea to clean your carburetor at least once a year, or more often if you use your chainsaw frequently or store it for extended periods. Check it if you notice performance issues.

Q7: What is the difference between adjusting and rebuilding a carburetor?
A7: Adjusting involves tweaking the existing settings of the Poulan chainsaw mixture screws to achieve optimal performance. Rebuilding involves disassembling the carburetor and replacing worn-out internal parts like diaphragms and gaskets to restore its function.

By following these detailed steps, you can effectively set your Poulan chainsaw carburetor, ensuring your saw runs powerfully and reliably. Regular maintenance and proper tuning will make your Poulan chainsaw a more enjoyable and effective tool.