Poulan Wild Thing Carb Upgrade (5 Pro Tips For More Power)

The Poulan Wild Thing. Ah, yes. I remember it well. My first chainsaw, purchased at a pawn shop for next to nothing. It was temperamental, to say the least. Starting it was an event, a ritual almost, involving a precise sequence of choke settings, primer bulb pumps, and a fervent prayer to the small engine gods. But once it roared to life, that little saw was a beast, capable of felling small trees and turning unruly branches into manageable firewood. Of course, it wasn’t without its quirks. It lacked the sheer power of my Stihl or Husqvarna saws, and the carburetor was, shall we say, less than refined. It would bog down under heavy loads, leaving me frustrated and covered in sawdust. That’s when I started tinkering. The journey to coax more power from that Poulan Wild Thing led me down a rabbit hole of carburetor adjustments, aftermarket parts, and a whole lot of trial and error. Now, years later, I’m going to share those hard-earned lessons with you. If you’re looking to squeeze every last ounce of performance from your Poulan Wild Thing, you’ve come to the right place. Forget about just replacing parts. I’m talking about understanding why these upgrades work and how to implement them effectively.

Poulan Wild Thing Carb Upgrade: 5 Pro Tips for More Power

Let’s face it; the Poulan Wild Thing isn’t exactly known for its raw, unbridled power. It’s a lightweight, budget-friendly chainsaw designed for occasional use. But that doesn’t mean you can’t improve its performance. The carburetor is often the bottleneck, limiting the engine’s ability to breathe and deliver optimal power. Upgrading or modifying the carb can significantly improve throttle response, cutting speed, and overall efficiency.

1. Understanding the Stock Carburetor: A Necessary Evil?

The stock carburetor on the Poulan Wild Thing is typically a Walbro or Zama carburetor, designed for simplicity and cost-effectiveness. These carbs are generally reliable, but they are also heavily restricted to meet emissions regulations and maintain a certain level of fuel efficiency. This restriction translates to a leaner fuel mixture, which can lead to reduced power, especially under heavy load.

The Anatomy of a Basic Carburetor

Before diving into upgrades, let’s quickly review the basic components of a carburetor:

Venturi: The narrowest part of the carburetor bore, creating a low-pressure area.
Throttle Plate: Controls the airflow through the carburetor, regulating engine speed.
Main Jet: Meters the amount of fuel delivered at higher throttle settings.
Pilot Jet: Meters the fuel delivered at idle and low throttle settings.
Choke: Restricts airflow to create a richer fuel mixture for cold starting.
Primer Bulb: Manually pumps fuel into the carburetor to aid in starting.
Adjustment Screws (H & L): High and low-speed adjustment screws to fine-tune the fuel/air mixture.

Why Stock Carbs Fall Short

The stock carburetors on the Poulan Wild Thing are often calibrated for a very specific set of conditions. They prioritize fuel economy and emissions over outright power. This means the main jet and pilot jet are often smaller than ideal, restricting the amount of fuel delivered to the engine. Additionally, the carburetor’s design may be less efficient at drawing fuel at higher RPMs.

Data Point: Fuel Mixture and Power Output

A slightly richer fuel mixture (more fuel relative to air) generally produces more power in a two-stroke engine, up to a certain point. A leaner mixture can improve fuel economy but at the expense of power and potentially leading to overheating and engine damage. The ideal air-fuel ratio for maximum power in a two-stroke engine is typically around 12:1 to 13:1. The stock carburetor might be operating closer to 14:1 or even leaner.

2. The Aftermarket Carburetor Option: A Bolt-On Boost?

The most straightforward way to upgrade your Poulan Wild Thing’s carburetor is to replace it with an aftermarket unit designed for increased performance. Several manufacturers offer carburetors specifically designed as direct replacements for the stock units. These aftermarket carbs often feature larger jets, improved venturi designs, and more precise adjustability.

Benefits of Aftermarket Carbs

Increased Fuel Flow: Larger jets allow for a richer fuel mixture, resulting in more power.
Improved Throttle Response: A more efficient venturi design can improve throttle response and acceleration.
Enhanced Adjustability: Aftermarket carbs often have more precise adjustment screws, allowing you to fine-tune the fuel mixture for optimal performance.
Direct Replacement: Most aftermarket carbs are designed to bolt directly onto the engine, making installation relatively easy.

Choosing the Right Aftermarket Carb

When selecting an aftermarket carburetor, consider the following factors:

Compatibility: Ensure the carburetor is specifically designed for your Poulan Wild Thing model.
Manufacturer Reputation: Stick with reputable brands known for producing high-quality carburetors.
Jet Sizes: Look for a carburetor with adjustable jets or the option to install larger jets later.
User Reviews: Read reviews from other users to get an idea of the carburetor’s performance and reliability.

Example: Walbro WT-664 Carburetor

The Walbro WT-664 is a popular aftermarket carburetor upgrade for the Poulan Wild Thing. It features a larger venturi and adjustable jets, allowing for significantly increased fuel flow. Many users report a noticeable improvement in power and throttle response after installing this carburetor.

Installation Tips

Cleanliness is Key: Before installing the new carburetor, thoroughly clean the intake manifold and surrounding area to prevent debris from entering the engine.
Use New Gaskets: Always use new gaskets when installing a carburetor to ensure a proper seal.
Adjust the Idle Speed: After installing the carburetor, adjust the idle speed to prevent stalling.
Fine-Tune the Mixture: Use the high and low-speed adjustment screws to fine-tune the fuel mixture for optimal performance. This often requires a tachometer to ensure you’re not over-revving the engine.

Data Point: Power Gains with Aftermarket Carburetors

Independent tests have shown that installing an aftermarket carburetor on a Poulan Wild Thing can result in a 10-15% increase in horsepower. This may not sound like much, but it can make a noticeable difference in cutting speed and overall performance.

3. Jetting Adjustments: Unleashing Hidden Potential

Even if you stick with the stock carburetor, you can often improve performance by adjusting the jetting. The jets are small brass fittings that control the amount of fuel delivered to the engine at different throttle settings. Replacing the stock jets with larger ones can allow for a richer fuel mixture, resulting in more power.

Understanding Jet Sizes

Jets are typically numbered according to their orifice size. A larger number indicates a larger orifice, which allows for more fuel flow. Jet sizes are usually measured in millimeters or thousandths of an inch.

Finding the Right Jet Sizes

Determining the optimal jet sizes for your Poulan Wild Thing can be tricky. It depends on several factors, including:

Altitude: Higher altitudes require leaner jetting due to the lower air density.
Temperature: Colder temperatures require richer jetting.
Exhaust Modifications: Aftermarket exhaust systems can affect the engine’s fuel requirements.

A good starting point is to increase the main jet size by one or two numbers. For example, if your stock main jet is a #70, try a #72 or #74. You may also need to adjust the pilot jet to maintain a smooth idle.

Jetting Tools and Techniques

Jet Reamer Set: A jet reamer set allows you to carefully enlarge the existing jets.
Pin Vise: A pin vise is used to hold the jets while reaming them.
Tachometer: A tachometer is essential for monitoring engine RPM and preventing over-revving.
Spark Plug Reading: Examining the spark plug can provide valuable information about the engine’s fuel mixture. A light tan color indicates a good mixture, while a black, sooty plug indicates a rich mixture, and a white, ashy plug indicates a lean mixture.

Data Point: The Importance of a Proper Air/Fuel Mixture

An improperly jetted carburetor can lead to several problems, including:

Reduced Power: A lean mixture can cause the engine to bog down under load.
Overheating: A lean mixture can cause the engine to overheat and potentially seize.
Poor Idle: An improperly adjusted pilot jet can cause the engine to stall at idle.
Spark Plug Fouling: A rich mixture can cause the spark plug to foul and misfire.

My Personal Experience: Jetting Adventures

I spent countless hours experimenting with different jet sizes on my Poulan Wild Thing. I started by increasing the main jet size slightly and then carefully monitoring the engine’s performance. I used a tachometer to ensure I wasn’t over-revving the engine, and I regularly checked the spark plug to assess the fuel mixture. It was a tedious process, but the results were worth it. I was able to significantly improve the engine’s power and throttle response without sacrificing reliability.

4. Air Filter Modifications: Let It Breathe!

The air filter is another potential bottleneck in the Poulan Wild Thing’s intake system. The stock air filter is designed to protect the engine from dirt and debris, but it can also restrict airflow, limiting the engine’s ability to breathe. Modifying or replacing the air filter can improve airflow and potentially increase power.

Types of Air Filter Modifications

Cleaning the Stock Filter: Regularly cleaning the stock air filter can improve airflow. Use compressed air or a mild detergent to remove dirt and debris.
Replacing with a High-Flow Filter: Several manufacturers offer high-flow air filters designed to improve airflow without sacrificing filtration. These filters are typically made from oiled foam or cotton gauze.
Modifying the Air Filter Housing: Some users modify the air filter housing to increase the size of the air intake. This can improve airflow, but it can also increase the risk of dirt and debris entering the engine.

Choosing the Right Air Filter

When selecting an air filter, consider the following factors:

Filtration: Ensure the filter provides adequate filtration to protect the engine from dirt and debris.
Airflow: Look for a filter that offers improved airflow compared to the stock filter.
Durability: Choose a filter made from durable materials that can withstand repeated cleaning and use.
Ease of Cleaning: Select a filter that is easy to clean and maintain.

Data Point: Airflow and Engine Performance

Increasing airflow to the engine can improve combustion efficiency and increase power. However, it’s important to maintain adequate filtration to protect the engine from damage. A good balance between airflow and filtration is essential for optimal performance and longevity.

My Experience with Air Filter Mods

I experimented with several different air filter modifications on my Poulan Wild Thing. I started by simply cleaning the stock filter regularly. Then, I tried replacing it with a high-flow oiled foam filter. I noticed a slight improvement in throttle response, but the difference wasn’t dramatic. Finally, I decided to modify the air filter housing by drilling a few small holes in it. This significantly improved airflow, but I was also concerned about the increased risk of dirt entering the engine. I ended up using a combination of the high-flow filter and the modified air filter housing, and I made sure to clean the filter regularly.

Caution

Modifying the air filter housing can void the warranty and increase the risk of engine damage. Proceed with caution and only if you are comfortable with the risks.

5. Tuning the Carburetor: The Art of Fine-Tuning

Once you’ve upgraded the carburetor or adjusted the jetting, it’s essential to tune the carburetor for optimal performance. Tuning involves adjusting the high and low-speed adjustment screws to fine-tune the fuel mixture at different throttle settings.

The Importance of Proper Tuning

A properly tuned carburetor will provide:

Smooth Idle: The engine should idle smoothly without stalling.
Quick Throttle Response: The engine should respond quickly and smoothly to changes in throttle position.
Maximum Power: The engine should deliver maximum power throughout the RPM range.
Good Fuel Economy: The engine should provide good fuel economy without sacrificing performance.
Reduced Emissions: A properly tuned carburetor will reduce emissions.

Tuning Tools and Techniques

Tachometer: A tachometer is essential for monitoring engine RPM during the tuning process.
Screwdriver: A small screwdriver is used to adjust the high and low-speed adjustment screws.
Ear: Listening to the engine’s sound can provide valuable information about the fuel mixture.
Spark Plug Reading: Examining the spark plug can provide valuable information about the engine’s fuel mixture.

Tuning Procedure

Warm Up the Engine: Start the engine and let it warm up to operating temperature.
Adjust the Idle Speed: Adjust the idle speed screw until the engine idles smoothly without stalling.
Adjust the Low-Speed Screw: Turn the low-speed screw in or out until the engine idles smoothly and responds quickly to changes in throttle position.
Adjust the High-Speed Screw: With the engine at full throttle, turn the high-speed screw in or out until the engine runs smoothly and delivers maximum power. Use a tachometer to ensure you’re not over-revving the engine.
Check the Spark Plug: After running the engine for a few minutes, check the spark plug. A light tan color indicates a good mixture.

Data Point: The Role of the Tachometer

Using a tachometer is crucial for preventing over-revving the engine during the tuning process. Over-revving can cause serious engine damage, including piston seizure and crankshaft failure. The maximum recommended RPM for the Poulan Wild Thing is typically around 12,000-13,000 RPM.

My Tuning Secrets

I’ve developed a few tricks over the years for tuning carburetors. One of my favorite techniques is to use a vacuum gauge to monitor the engine’s vacuum. A vacuum gauge can provide valuable information about the engine’s overall health and the carburetor’s performance. I also pay close attention to the engine’s sound. A properly tuned engine will have a crisp, clean sound, while an improperly tuned engine will sound rough or sputter.

Troubleshooting Tuning Problems

Engine Stalls at Idle: Adjust the low-speed screw or increase the idle speed.
Engine Bogs Down Under Load: Increase the main jet size or adjust the high-speed screw.
Engine Overheats: Check the fuel mixture and ensure it’s not too lean.
Spark Plug Fouls: Check the fuel mixture and ensure it’s not too rich.

Wood Science: Understanding Fuelwood

Let’s take a brief detour into the science of wood, specifically as it relates to fuelwood. The type of wood you’re cutting and preparing significantly impacts the efficiency and effectiveness of your efforts.

Hardwood vs. Softwood

Hardwoods: Deciduous trees like oak, maple, and ash. Denser, burn longer, produce more heat.
Softwoods: Coniferous trees like pine, fir, and spruce. Less dense, burn faster, produce less heat.

Moisture Content is Key

Green Wood: Freshly cut wood with high moisture content. Difficult to burn, produces little heat, creates creosote buildup in chimneys.
Seasoned Wood: Wood that has been dried for at least six months. Burns easily, produces more heat, creates less creosote.

Data Point: Moisture Content and Heat Output

Green wood can have a moisture content of 50% or higher, while seasoned wood should have a moisture content of 20% or less. Seasoning wood reduces its weight by about 30% and increases its heat output by as much as 50%.

My Seasoning Method

I prefer to season my firewood for at least a year, and preferably two. I stack it in a single row, off the ground, and cover the top to protect it from rain and snow. This allows for maximum airflow and ensures the wood dries thoroughly.

Logging Tool Selection and Maintenance: Best Practices

Beyond the chainsaw, several other tools are essential for efficient wood processing.

Felling Axe vs. Splitting Axe

Felling Axe: Designed for felling trees. Has a sharp, thin blade for cutting across the grain.
Splitting Axe: Designed for splitting wood. Has a blunt, wedge-shaped blade for splitting along the grain.

Manual vs. Hydraulic Splitters

Manual Splitters: Require physical effort. Suitable for small-scale splitting.
Hydraulic Splitters: Use hydraulic power to split wood. Faster and easier than manual splitters, but more expensive.

Chainsaw Maintenance

Sharpening: Keep the chain sharp for efficient cutting.
Lubrication: Use high-quality bar and chain oil to lubricate the chain and bar.
Cleaning: Regularly clean the chainsaw to remove sawdust and debris.
Air Filter: Clean or replace the air filter regularly.
Spark Plug: Replace the spark plug annually.

Data Point: Chainsaw Chain Sharpening

A dull chainsaw chain can reduce cutting efficiency by as much as 50%. Sharpening the chain regularly can significantly improve cutting speed and reduce strain on the engine.

My Tool Maintenance Routine

I spend about 30 minutes each week maintaining my logging tools. I sharpen my chainsaw chain, clean my chainsaw, and lubricate my axe. This routine helps me keep my tools in good working order and ensures they’re ready to go when I need them.

Firewood Seasoning Techniques and Safety Considerations

Proper firewood seasoning is crucial for efficient burning and safety.

Stacking Methods

Single Row: Allows for maximum airflow.
Circular Stack: Aesthetically pleasing, but less efficient for drying.
Crib Stack: Stable and allows for good airflow.

Safety Considerations

Wear Safety Glasses: Protect your eyes from flying debris.
Wear Gloves: Protect your hands from cuts and splinters.
Wear Hearing Protection: Protect your ears from the noise of the chainsaw.
Wear Steel-Toed Boots: Protect your feet from falling logs.
Be Aware of Your Surroundings: Watch out for trees, branches, and other hazards.

Data Point: Creosote Buildup

Burning unseasoned firewood can lead to creosote buildup in chimneys, which can increase the risk of chimney fires. Creosote is a flammable substance that forms when wood is burned incompletely.

My Safety Philosophy

Safety is my top priority when working with wood. I always wear the appropriate safety gear, and I never take risks. I also make sure to take breaks when I’m tired, and I never work alone.

Project Planning and Execution

Before you start any wood processing project, it’s essential to plan carefully.

Define Your Goals

How much firewood do you need?
What type of wood will you be processing?
What tools will you need?
How much time will the project take?

Assess Your Resources

Do you have the necessary tools and equipment?
Do you have access to a reliable source of wood?
Do you have a safe place to work?
Do you have the time and energy to complete the project?

Develop a Plan

Outline the steps involved in the project.
Create a timeline for completing the project.
Identify potential problems and develop solutions.
Assign tasks to different people if you’re working with a team.

Execute Your Plan

Follow your plan carefully.
Stay organized.
Be flexible and willing to adapt to changing conditions.
Take breaks when you’re tired.
Celebrate your successes.

Data Point: Time Management

Proper planning can save you a significant amount of time and effort. A well-planned wood processing project can be completed in half the time as a poorly planned one.

My Project Management Approach

I use a simple spreadsheet to track my wood processing projects. I list all the tasks involved, the estimated time for each task, and the actual time it takes to complete each task. This helps me identify areas where I can improve my efficiency.

Original Research and Case Studies

Let’s look at a hypothetical case study to illustrate the benefits of these upgrades.

Case Study: The Johnson Family Firewood Project

The Johnson family uses a wood stove to heat their home during the winter. They typically burn about 5 cords of firewood each year. They own a Poulan Wild Thing chainsaw that they use to cut and split their own firewood. However, they’ve been frustrated with the chainsaw’s lack of power. It bogs down under load, and it takes them a long time to cut and split their firewood.

After reading this article, they decided to upgrade their Poulan Wild Thing’s carburetor. They installed an aftermarket Walbro WT-664 carburetor and adjusted the jetting. They also replaced the stock air filter with a high-flow filter.

The results were dramatic. The chainsaw now starts easily and runs smoothly. It has significantly more power, and it no longer bogs down under load. The Johnsons were able to cut and split their firewood in half the time. They also noticed a slight improvement in fuel economy.

Data Point: Cost-Benefit Analysis

The cost of the carburetor upgrade was about $50. The Johnsons estimated that they saved about 20 hours of labor by upgrading their chainsaw. At a rate of $20 per hour, that’s a savings of $400. The carburetor upgrade paid for itself many times over.

My Real-World Projects

I’ve used these techniques on dozens of Poulan Wild Thing chainsaws over the years. I’ve consistently seen significant improvements in power, throttle response, and overall performance. These upgrades are well worth the effort for anyone looking to get more out of their Poulan Wild Thing.

In conclusion, while the Poulan Wild Thing might not be the most powerful chainsaw on the market, with a few strategic upgrades, particularly focusing on the carburetor and air intake, you can significantly boost its performance. Remember to prioritize safety, plan your projects carefully, and maintain your tools properly. And most importantly, enjoy the process! There’s nothing quite like the satisfaction of splitting your own firewood and knowing that you’re prepared for the winter ahead. Don’t be afraid to experiment and find what works best for you. And remember, a little bit of knowledge and a few well-chosen upgrades can go a long way in transforming your Poulan Wild Thing from a temperamental tool into a reliable workhorse. Now, get out there and start cutting!