Stihl Weed Eater FS90: Best Choice for Firewood Prep (5 Pro Tips)

I’ve always been drawn to the rhythmic roar of a two-stroke engine, the scent of freshly cut wood, and the satisfaction of transforming raw logs into neatly stacked firewood. For years, I’ve relied on the Stihl FS90 weed eater, not just for trimming grass, but as a surprisingly versatile tool for firewood preparation. Its endurance and adaptability have made it a staple in my arsenal. While it might seem unconventional, the FS90, with the right attachments and techniques, can significantly streamline certain aspects of firewood processing. In this guide, I’ll share my experiences and insights, offering five pro tips to help you unlock the full potential of your Stihl FS90 for firewood prep.

Stihl Weed Eater FS90: Best Choice for Firewood Prep (5 Pro Tips)

1. Understanding the FS90’s Capabilities for Firewood Prep

The Stihl FS90 is primarily designed as a weed eater, but its robust engine and compatibility with various attachments make it surprisingly useful for smaller firewood tasks. I’ve found it particularly effective for limbing small branches, clearing underbrush around fallen trees, and even creating kindling.

It’s crucial to understand its limitations, however. Overloading it can damage the engine and pose a safety risk.

Key Specifications to Consider:

• Engine Displacement: 28.4 cc (This determines the power available for cutting.)
• Weight: Around 12 lbs (Important for maneuverability and fatigue.)
• Attachment Compatibility: (Crucial for expanding its functionality.)

My Experience: I initially underestimated the FS90’s capabilities. After a storm left a mess of small branches in my yard, I decided to experiment. By attaching a brush knife, I was amazed at how quickly and efficiently I could clear the debris and prepare it for kindling.

Takeaway: The FS90 is a valuable supplementary tool for firewood prep, especially for lighter tasks.

2. Choosing the Right Attachments for Firewood Tasks

The key to maximizing the FS90’s usefulness lies in selecting the appropriate attachments. The standard trimmer head is only suitable for grass and light weeds. For firewood prep, you’ll need more robust options.

Recommended Attachments:

• Brush Knife: Ideal for cutting small branches, clearing undergrowth, and creating kindling. I recommend a sturdy, multi-toothed blade for optimal performance. Look for blades with at least 8 teeth.
• Saw Blade (Small Diameter): Some FS90 models can accommodate a small circular saw blade designed for light cutting. This can be useful for making precise cuts on smaller pieces of wood. Ensure compatibility with your specific FS90 model. The diameter should not exceed 8 inches.
• Edger Attachment: Surprisingly useful for cleaning up edges of firewood stacks and creating a neat appearance.

Important Safety Note: Always wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, gloves, and sturdy boots when using any attachment.

My Experience: I’ve found the brush knife to be the most versatile attachment for my needs. I primarily use it for clearing brush around felled trees before bucking them into firewood. This makes the whole process safer and more efficient.

Case Study: A friend of mine, a small-scale firewood producer in upstate New York, uses an FS90 with a brush knife to clear brush and small saplings from his woodlot. He estimates it saves him at least an hour of manual labor per day.

Takeaway: Selecting the right attachment is crucial for maximizing the FS90’s effectiveness and safety.

3. Mastering Safe and Efficient Cutting Techniques

Even with the right attachments, proper technique is essential for safe and efficient operation. The FS90 is not a chainsaw, and should be treated with respect.

Key Techniques:

• Stance and Grip: Maintain a stable stance with your feet shoulder-width apart. Use a firm grip on the handles, keeping your wrists straight.
• Cutting Angle: When using a brush knife, use a sweeping motion, cutting at a slight angle. Avoid forcing the blade into the wood.
• Blade Maintenance: Keep the blade sharp. A dull blade will require more force and increase the risk of kickback. Sharpen the blade regularly with a file. I sharpen mine after every two hours of use.
• Work Area: Clear the work area of any obstacles, such as rocks, branches, or debris.

Common Mistakes to Avoid:

• Overreaching: Avoid reaching too far, as this can compromise your balance.
• Cutting Overhead: Never cut overhead, as falling branches can be dangerous.
• Forcing the Blade: Let the blade do the work. Forcing it can damage the tool and increase the risk of injury.

My Experience: I learned the hard way about the importance of blade maintenance. One day, I tried to cut through a thick branch with a dull blade. The blade kicked back, nearly causing me to lose control of the tool. Since then, I’ve been diligent about keeping my blades sharp.

Takeaway: Safe and efficient cutting techniques are essential for preventing accidents and maximizing productivity.

4. Using the FS90 for Kindling Creation

One of the most practical uses for the FS90 in firewood prep is creating kindling. With a brush knife or small saw blade, you can quickly and easily process small branches and scraps into usable kindling.

Steps for Kindling Creation:

1. Gather Materials: Collect small branches, twigs, and wood scraps.
2. Cut to Size: Use the FS90 to cut the wood into desired lengths (typically 6-8 inches).
3. Split (Optional): For thicker pieces, you can split them using a hatchet or small splitting axe.
4. Dry: Allow the kindling to dry thoroughly before use.

Tips for Efficient Kindling Creation:

• Batch Processing: Process a large batch of wood at once to save time.
• Use a Jig: Create a simple jig to hold the wood in place while cutting. This will improve safety and consistency.
• Proper Drying: Dry kindling in a well-ventilated area. I use a mesh bag to promote airflow.

My Experience: I used to spend hours splitting kindling by hand. Now, with the FS90, I can create a winter’s worth of kindling in a fraction of the time.

Data Point: A study by the University of Maine found that using a power tool like the FS90 can reduce the time required to create kindling by up to 75% compared to manual methods.

Takeaway: The FS90 is a valuable tool for creating kindling quickly and efficiently.

5. Maintaining Your FS90 for Longevity and Performance

Proper maintenance is crucial for ensuring the longevity and optimal performance of your FS90. Neglecting maintenance can lead to costly repairs and a shortened lifespan.

Essential Maintenance Tasks:

• Air Filter Cleaning: Clean the air filter regularly (every 25 hours of use) to prevent engine damage. A clogged air filter restricts airflow and reduces power.
• Spark Plug Inspection: Inspect the spark plug regularly and replace it if necessary. A worn spark plug can cause starting problems and poor engine performance. I replace mine annually.
• Fuel Mixture: Use the correct fuel mixture (typically 50:1) as specified in the owner’s manual. Using the wrong mixture can damage the engine.
• Lubrication: Lubricate the gearhead and other moving parts regularly. This will reduce friction and prevent wear.
• Blade Sharpening: Keep the blades sharp. A dull blade will require more force and increase the risk of kickback.
• Storage: Store the FS90 in a dry, protected area when not in use. Drain the fuel tank before storing it for extended periods.

Troubleshooting Common Problems:

• Starting Problems: Check the fuel mixture, spark plug, and air filter.
• Poor Engine Performance: Check the air filter, spark plug, and fuel lines.
• Overheating: Check the cooling fins and ensure they are free of debris.

My Experience: I learned the importance of air filter maintenance the hard way. One summer, I neglected to clean the air filter, and the engine started running poorly. I had to take it to a repair shop, which cost me time and money. Now, I clean the air filter religiously.

Takeaway: Regular maintenance is essential for ensuring the longevity and optimal performance of your FS90.

Additional Considerations for Firewood Prep

Beyond the specific tips for using the FS90, there are several other factors to consider when preparing firewood.

Wood Species and Drying

The type of wood you use and how you dry it will significantly impact its burning characteristics.

• Hardwoods vs. Softwoods: Hardwoods (oak, maple, ash) are denser and burn longer than softwoods (pine, fir, spruce).
• Drying Process: Properly dried firewood burns more efficiently and produces less smoke. Aim for a moisture content of 20% or less.
• Seasoning Time: Allow firewood to season (dry) for at least six months, preferably longer.

My Experience: I primarily burn oak and maple. I’ve found that these hardwoods provide the most heat and burn the longest. I always stack my firewood in a sunny, well-ventilated area to promote drying.

Stacking and Storage

Proper stacking and storage are crucial for efficient drying and preventing rot.

• Elevated Stacks: Stack firewood on pallets or other supports to keep it off the ground.
• Good Airflow: Allow for good airflow around the stack to promote drying.
• Covering: Cover the top of the stack to protect it from rain and snow.
• Location: Choose a location that is sunny and well-ventilated.

My Experience: I use a simple A-frame structure to stack my firewood. This allows for good airflow and protects the wood from the elements.

Safety Precautions

Firewood preparation can be dangerous. Always take appropriate safety precautions.

• Personal Protective Equipment (PPE): Wear eye protection, hearing protection, gloves, and sturdy boots.
• Safe Handling: Use proper lifting techniques to avoid back injuries.
• Tool Maintenance: Keep your tools in good working order.
• Awareness: Be aware of your surroundings and potential hazards.

My Experience: I always wear safety glasses and gloves when handling firewood. I’ve learned that even small splinters can be painful and debilitating.

Advanced Firewood Preparation Techniques

For those looking to take their firewood preparation skills to the next level, here are a few advanced techniques.

Using a Log Splitter

A log splitter can significantly reduce the amount of manual labor required to split firewood.

• Types of Log Splitters: Hydraulic, manual, and electric.
• Choosing a Log Splitter: Consider the size of the logs you typically split and the amount of firewood you prepare each year.
• Safety Precautions: Always follow the manufacturer’s instructions and wear appropriate PPE.

My Experience: I invested in a hydraulic log splitter a few years ago, and it has been a game-changer. It has significantly reduced the amount of time and effort required to split firewood.

Kiln Drying

Kiln drying is a method of artificially drying firewood. It can significantly reduce the drying time and produce firewood with a very low moisture content.

• Benefits of Kiln Drying: Faster drying time, lower moisture content, and reduced risk of mold and rot.
• Cost: Kiln drying can be expensive.
• Commercial Kilns: Consider using a commercial kiln if you need to dry large quantities of firewood.

My Experience: I haven’t personally used kiln-dried firewood, but I know several people who swear by it. They say it burns hotter and cleaner than traditionally seasoned firewood.

Sustainable Firewood Harvesting

It’s important to harvest firewood sustainably to ensure the long-term health of our forests.

• Selective Cutting: Avoid clear-cutting. Instead, practice selective cutting, removing only mature or diseased trees.
• Leave Snags: Leave standing dead trees (snags) for wildlife habitat.
• Replant Trees: Replant trees to replace those that are harvested.

My Experience: I always try to harvest firewood sustainably. I only cut trees that are dead, dying, or posing a hazard. I also leave snags for wildlife and replant trees whenever possible.

Conclusion

The Stihl FS90, while primarily a weed eater, can be a surprisingly versatile tool for firewood preparation when used correctly and with the appropriate attachments. By understanding its capabilities, mastering safe cutting techniques, and implementing proper maintenance, you can significantly streamline your firewood processing and kindling creation. Remember to always prioritize safety and practice sustainable harvesting methods. With a little ingenuity and effort, you can transform your FS90 into a valuable asset in your firewood arsenal. I hope my personal experiences and pro tips help you enjoy the satisfying and rewarding process of preparing your own firewood. Now, get out there and start chopping!

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