Stihl 039 HP Review (5 Pro Tips for Efficient Wood Processing)

Alright, picture this: I’m standing in my backyard, covered head-to-toe in sawdust, looking like a yeti who just lost a fight with a lumber yard. My wife walks out, takes one look at me, and says, “Honey, did the forest explode?” That, my friends, pretty much sums up my early experiences with wood processing.

Today, we’re diving deep into a piece of equipment that’s helped me avoid future “forest explosions”: the Stihl 039. This isn’t just any chainsaw; it’s a workhorse that, with the right know-how, can turn you from a weekend warrior into a wood-processing ninja. We’re not just talking specs here; we’re talking real-world tips and tricks I’ve learned over years of felling, bucking, and splitting. So grab your safety glasses, and let’s get started!

Stihl 039 HP Review: Unleash Your Wood Processing Potential (5 Pro Tips)

The Stihl 039. It’s a name that resonates with many who’ve spent time in the woods. While it might be considered a slightly older model now, its reputation for reliability and power endures. This article is about more than just reviewing a chainsaw; it’s about unlocking its full potential and maximizing your wood processing efficiency.

Why the Stihl 039 Still Matters

Even with newer, fancier models on the market, the Stihl 039 holds its own. Here’s why:

• Durability: These saws were built to last. With proper maintenance, they can run for years, even decades.
• Power: The 039 packs enough punch to handle a wide range of tasks, from felling medium-sized trees to bucking firewood.
• Simplicity: Unlike some modern saws loaded with electronics, the 039 is relatively straightforward to repair and maintain. This is a huge advantage for those of us who like to tinker.
• Availability: Parts are still readily available, and you can often find used 039s in decent condition for a reasonable price.

Now, let’s get to the heart of the matter: how to get the most out of your Stihl 039.

1. Mastering Chain Selection and Sharpening

The chain is the business end of any chainsaw. Choosing the right one and keeping it sharp is critical for efficient wood processing.

Understanding Chain Types

There are several types of chainsaw chains, each designed for different purposes:

• Full Chisel: These chains have square-cornered teeth and are the fastest cutting but dull quickly if they contact dirt or debris. I only use these on clean wood.
• Semi-Chisel: These chains have rounded corners on the teeth, making them more durable and forgiving in dirty conditions. These are my go-to for most firewood cutting.
• Low-Profile: These chains have a smaller cutter and are designed for safety and ease of use, often found on smaller saws. While safer, they’re less efficient for larger tasks.
• Ripping Chain: These chains are designed to cut with the grain of the wood, ideal for milling lumber.

For the Stihl 039, a semi-chisel chain with a .325″ pitch and .063″ gauge is a good all-around choice. The specific number of drive links will depend on the length of your bar.

The Art of Sharpening

A dull chain is not only inefficient; it’s dangerous. It forces you to apply more pressure, increasing the risk of kickback. Sharpening your chain is an essential skill.

Here’s my process:

1. Secure the Chain: Use a vise to hold the chain firmly in place. I use a bar-mounted vise that clamps directly onto the chainsaw bar.
2. Use the Right File: A round file of the correct diameter (typically 5/32″ for a .325″ pitch chain) is essential. Also, use a flat file for adjusting the depth gauges.
3. Maintain the Correct Angle: Use a file guide to ensure you’re sharpening each tooth at the correct angle (typically 30 degrees for the cutting angle and 85 degrees for the top plate angle).
4. Consistent Strokes: Use smooth, consistent strokes, filing from the inside of the tooth outwards. I usually aim for 3-5 strokes per tooth.
5. Check Depth Gauges: After sharpening, check the depth gauges (the small rakers in front of each cutting tooth). If they’re too high, the chain won’t bite properly. Use a flat file and a depth gauge tool to file them down to the correct height. Generally, I prefer to keep depth gauges slightly lower for cutting frozen wood during winter.
6. Consistency is Key: Sharpen each tooth the same amount to ensure even cutting.

Pro Tip: Invest in a good quality file guide. It will make sharpening much easier and more consistent. I personally use the Stihl 2-in-1 filing tool, which sharpens both the cutting tooth and depth gauge in one go. It’s a game-changer.

Data-Backed Insights: Chain Sharpness and Cutting Efficiency

Research has shown that a sharp chain can increase cutting efficiency by as much as 50%. A study published in the “Journal of Forestry Engineering” found that dull chains require significantly more force to cut through wood, leading to increased operator fatigue and a higher risk of accidents. This is why I always prioritize chain maintenance.

2. Fuel and Lubrication: The Lifeblood of Your Saw

The Stihl 039, like any two-stroke engine, relies on a precise mixture of fuel and oil. Using the wrong fuel or oil can lead to poor performance, engine damage, and a shorter lifespan.

Fuel Mixture

The recommended fuel mixture for the Stihl 039 is typically 50:1 (50 parts gasoline to 1 part oil). Always use a high-quality two-stroke oil specifically designed for air-cooled engines.

Important Considerations:

• Ethanol: Ethanol-blended fuels can cause problems in small engines. Ethanol attracts water, which can lead to corrosion and fuel system issues. If possible, use ethanol-free gasoline. If you must use ethanol-blended fuel, use a fuel stabilizer.
• Octane: Use gasoline with an octane rating of 89 or higher.
• Mixing: Mix the fuel and oil thoroughly in a separate container before adding it to the saw’s fuel tank. I always use a graduated mixing bottle to ensure the correct ratio.

Chain Oil

Chain oil serves two critical functions: it lubricates the chain and bar, reducing friction and wear, and it helps to flush away sawdust and debris.

Choosing the Right Chain Oil:

• Viscosity: Use a chain oil with the correct viscosity for the ambient temperature. In colder weather, use a thinner oil to ensure proper flow. In warmer weather, use a thicker oil to prevent it from being thrown off the chain too quickly.
• Tackiness: Look for a chain oil that is “tacky,” meaning it clings to the chain and bar. This helps to reduce oil consumption and provides better lubrication.
• Biodegradability: Consider using a biodegradable chain oil, especially if you’re working in environmentally sensitive areas.

Pro Tip: I add a small amount of bar and chain oil to my fuel mix. This helps lubricate the engine’s internal parts and extends its life. It’s an old logger’s trick, but it works.

Data-Backed Insights: Fuel Quality and Engine Life

Studies have shown that using high-quality fuel and oil can significantly extend the life of a two-stroke engine. A study by the “Society of Automotive Engineers” found that engines using premium fuel and synthetic oil experienced up to 30% less wear and tear compared to engines using standard fuel and mineral oil.

3. Mastering Felling Techniques

Felling a tree is one of the most dangerous aspects of wood processing. Proper technique is essential for safety and efficiency.

Planning Your Fell

Before you even start your saw, take the time to assess the situation.

• Lean: Determine the natural lean of the tree.
• Wind: Consider the wind direction.
• Obstacles: Identify any obstacles that could affect the tree’s fall, such as other trees, power lines, or buildings.
• Escape Route: Plan a clear escape route at a 45-degree angle away from the direction of the fall.

The Felling Cut

The felling cut consists of three main steps:

1. Notch Cut (or Face Cut): This cut determines the direction of the fall. It consists of two cuts: an upper cut at a 45-degree angle and a lower horizontal cut that meets the upper cut. The depth of the notch should be about 1/5 to 1/3 of the tree’s diameter.
2. Hinge: Leave a hinge of uncut wood between the notch and the back cut. The hinge controls the fall of the tree and prevents it from kicking back. The hinge should be about 80% of the tree’s diameter.
3. Back Cut: This cut is made on the opposite side of the tree from the notch, slightly above the horizontal cut of the notch. Cut towards the hinge, leaving the hinge intact.

Important Considerations:

• Bore Cutting: For larger trees, you may need to use a bore cut to avoid pinching the bar. This involves plunging the tip of the bar into the tree and cutting outwards.
• Wedges: Use felling wedges to help direct the fall of the tree, especially if it’s leaning in the wrong direction.
• Communication: If you’re working with others, use clear communication signals to ensure everyone is aware of your intentions.

Pro Tip: I always carry a small folding saw in my pocket. It’s invaluable for clearing brush and small trees that might obstruct my escape route.

Data-Backed Insights: Felling Accidents

According to the Occupational Safety and Health Administration (OSHA), felling trees is one of the most hazardous occupations in the logging industry. A significant percentage of felling accidents are caused by improper technique and inadequate planning. Taking the time to plan your fell and using proper techniques can dramatically reduce your risk of injury.

4. Bucking and Limbing for Efficiency

Once the tree is on the ground, the next step is to buck it into manageable lengths and limb it.

Limbing Techniques

Limbing involves removing the branches from the felled tree.

• Work from the Base: Start at the base of the tree and work your way towards the top.
• Cut on the Opposite Side: Stand on the opposite side of the tree from the branch you’re cutting. This reduces the risk of being hit by the branch as it falls.
• Support the Branch: If the branch is large, support it with your hand or foot to prevent it from pinching the bar.
• Be Aware of Tension: Be aware of branches that are under tension. These can spring back unexpectedly when cut.

Bucking Techniques

Bucking involves cutting the tree into shorter lengths.

• Plan Your Cuts: Before you start cutting, plan your cuts to minimize waste and maximize efficiency.
• Support the Log: If the log is lying on the ground, support it with other logs or branches to prevent the bar from pinching.
• Use Proper Stance: Maintain a stable stance and keep your feet shoulder-width apart.
• Avoid Pinching: If the bar starts to pinch, stop cutting and use a wedge to open the cut.

Common Bucking Cuts:

• Overbuck: Cutting from the top down. Use this when the log is supported on the ends.
• Underbuck: Cutting from the bottom up. Use this when the log is supported in the middle.
• Bore Cut: A plunging cut used to relieve compression or tension in the log.

Pro Tip: I use a chainsaw hook to drag logs into position. It saves my back and makes the job much easier.

Data-Backed Insights: Ergonomics and Efficiency

Studies have shown that proper ergonomics can significantly improve efficiency and reduce the risk of injury when bucking and limbing. Maintaining a good posture, using proper lifting techniques, and taking frequent breaks can help to prevent fatigue and strain.

5. Optimizing Firewood Preparation for Maximum BTU

Firewood is more than just wood; it’s stored energy. Optimizing your firewood preparation techniques can significantly increase its heat output and reduce your heating costs.

Wood Species and BTU Value

Different wood species have different BTU (British Thermal Unit) values. Hardwoods generally have higher BTU values than softwoods.

Here’s a comparison of some common firewood species:

Pro Tip: I always prioritize hardwoods for firewood. They burn longer and produce more heat. I use softwoods for kindling.

Seasoning Firewood

Seasoning firewood involves drying it to reduce its moisture content. Green wood can have a moisture content of 50% or higher, while seasoned firewood should have a moisture content of 20% or less.

Why Season Firewood?

• Increased Heat Output: Dry wood burns hotter and more efficiently.
• Reduced Smoke: Dry wood produces less smoke, which is better for your health and the environment.
• Easier to Ignite: Dry wood is easier to light.
• Reduced Creosote Buildup: Dry wood reduces creosote buildup in your chimney, which can prevent chimney fires.

Seasoning Techniques:

• Split the Wood: Splitting the wood exposes more surface area, allowing it to dry faster.
• Stack the Wood: Stack the wood in a single row, allowing air to circulate freely. I stack mine in rows that are no more than 4 feet high to prevent them from toppling over.
• Elevate the Wood: Elevate the wood off the ground to prevent moisture from wicking up from the soil. I use pallets or scrap wood to create a raised platform.
• Cover the Wood: Cover the top of the woodpile to protect it from rain and snow. Leave the sides open to allow air to circulate.
• Allow Time: Allow the wood to season for at least six months, and preferably a year or more.

Pro Tip: I use a moisture meter to check the moisture content of my firewood. It’s a worthwhile investment that takes the guesswork out of seasoning.

Data-Backed Insights: Moisture Content and Heat Output

Research has shown that the moisture content of firewood has a significant impact on its heat output. A study by the “U.S. Forest Service” found that wood with a moisture content of 50% produced only about half the heat of wood with a moisture content of 20%.

Beyond the Basics: Stihl 039 Maintenance

No review is complete without addressing maintenance. The Stihl 039, while durable, requires regular upkeep to keep it running smoothly.

• Air Filter: Clean the air filter regularly. A dirty air filter restricts airflow and can cause the engine to overheat.
• Spark Plug: Replace the spark plug annually.
• Fuel Filter: Replace the fuel filter annually.
• Bar and Chain: Clean the bar and chain regularly. Remove any sawdust and debris. Check the bar for wear and tear.
• Sharpening: As we discussed, keep the chain sharp.
• Storage: When storing the saw for extended periods, drain the fuel tank and run the engine until it stalls. This prevents fuel from gumming up the carburetor.

Real-World Case Study: My Oak Firewood Project

Let me share a story. A few years ago, I took on a project to fell and process a large oak tree that had come down in a storm. This was a big job, and I relied heavily on my Stihl 039.

The tree was about 30 inches in diameter at the base, and it was lying at an awkward angle. I had to use all my felling and bucking skills to safely dismantle it.

I started by limbing the tree, carefully removing the branches. Then, I bucked the trunk into 16-inch lengths, perfect for my wood stove. The oak was incredibly dense and heavy, and the 039 worked hard, but it never faltered.

After bucking the wood, I split it and stacked it in my wood shed. I seasoned it for a full year before burning it. That oak firewood provided incredible heat throughout the winter. It was a testament to the power of the Stihl 039 and the importance of proper wood processing techniques.

Final Thoughts: Embrace the Process

Wood processing is a challenging but rewarding endeavor. It connects you with nature, provides exercise, and offers the satisfaction of creating something useful from raw materials. The Stihl 039, with its power and reliability, is a valuable tool for anyone who wants to embrace the process.

Remember to prioritize safety, use proper techniques, and maintain your equipment. With a little practice and patience, you’ll be well on your way to becoming a wood-processing pro. Now, go forth and conquer those logs! And maybe, just maybe, you’ll avoid your own “forest explosion” moment. Happy cutting!

Actionable Next Steps:

1. Inspect your Stihl 039: Before your next wood-processing session, give your saw a thorough inspection. Check the air filter, spark plug, fuel filter, bar, and chain.
2. Sharpen your chain: A sharp chain is essential for safety and efficiency.
3. Plan your next project: Identify a wood-processing project and plan your approach. Consider the species of wood, the tools you’ll need, and the techniques you’ll use.
4. Practice safe techniques: Always prioritize safety when working with a chainsaw. Wear appropriate safety gear, use proper techniques, and be aware of your surroundings.
5. Share your experience: Share your wood-processing experiences with others. Learn from their successes and failures.

By following these steps, you can improve your wood-processing skills and get the most out of your Stihl 039.

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