Stihl 172 Chainsaw Specs (5 Pro Tips for Optimal Woodcutting)

Let’s embark on a journey into the world of woodcutting and firewood preparation, focusing on the Stihl 172 chainsaw. But first, let’s talk about why this matters beyond just having a warm fire. Working with wood, being outdoors, and engaging in physical labor like cutting and splitting firewood is incredibly beneficial for both physical and mental health. It’s a fantastic workout, a stress reliever, and connects you to nature in a tangible way. I’ve personally found immense satisfaction in transforming raw logs into neatly stacked firewood, knowing I’m providing warmth for my family and contributing to a sustainable heating source.

Mastering the Stihl 172: A Guide to Optimal Woodcutting & Firewood Prep

The Stihl 172 chainsaw is a popular choice for homeowners and small-scale firewood producers due to its balance of power, weight, and affordability. It’s a versatile tool capable of handling a variety of tasks, from felling small trees to limbing and bucking firewood. In this guide, I’ll share my expertise and insights to help you maximize the performance of your Stihl 172 and achieve optimal woodcutting results. I will cover the Stihl 172 chainsaw specs and provide 5 pro tips for optimal woodcutting.

Understanding the Stihl 172 Chainsaw

Before diving into specific techniques, it’s crucial to understand the specifications and features of the Stihl 172 chainsaw.

Stihl 172 Specifications: A Detailed Overview

• Engine: 2-stroke engine
• Displacement: Approximately 30.1 cc (cubic centimeters)
• Power Output: Around 1.6 kW (kilowatts) or 2.2 bhp (brake horsepower)
• Weight: Approximately 4.3 kg (9.5 lbs) without fuel, bar, and chain. This is a significant factor, as a lighter saw reduces fatigue during extended use.
• Fuel Tank Capacity: Around 0.27 liters
• Oil Tank Capacity: Around 0.26 liters
• Guide Bar Length: Typically available in 14-inch or 16-inch lengths. I personally prefer the 16-inch bar for added reach and versatility.
• Chain Pitch: 3/8″ P (Picco)
• Chain Gauge: 0.050″
• Automatic Chain Lubrication: Essential for reducing friction and extending the life of the chain and bar.
• Side-Mounted Chain Tensioner: Allows for easy chain adjustments.

Key Features and Benefits

• Anti-Vibration System: Reduces operator fatigue by minimizing vibrations transmitted to the hands and arms. This is a crucial feature for prolonged use.
• Ematic Lubrication System: Delivers precise amounts of oil to the chain and bar, reducing oil consumption.
• Single-Lever Master Control: Combines choke, start, and stop functions into one easy-to-use lever.
• Compensator: Maintains a constant fuel-air mixture, ensuring optimal engine performance even when the air filter is dirty.
• Pre-Separation Air Filtration System: Removes larger particles from the air intake, extending the life of the air filter.

Pro Tip #1: Mastering Chainsaw Safety

Safety is paramount when operating any chainsaw. Always wear appropriate personal protective equipment (PPE) and follow safe operating procedures.

Essential Personal Protective Equipment (PPE)

• Chainsaw Helmet: Provides head protection from falling branches and debris. Look for a helmet that meets ANSI Z89.1 standards.
• Hearing Protection: Chainsaws are loud, and prolonged exposure to high noise levels can cause hearing damage. Use earmuffs or earplugs with a noise reduction rating (NRR) of at least 25 dB.
• Eye Protection: Safety glasses or a face shield protect your eyes from flying wood chips and debris.
• Chainsaw Gloves: Provide a secure grip and protect your hands from cuts and abrasions.
• Chainsaw Chaps or Pants: These are crucial for protecting your legs from accidental contact with the chain. They contain layers of ballistic nylon that can jam the chain and prevent serious injury. I had a close call once where my chaps saved me from a potentially severe leg injury.
• Steel-Toed Boots: Protect your feet from falling logs and other hazards.

Safe Operating Procedures

• Read the Owner’s Manual: Familiarize yourself with the chainsaw’s features, operation, and safety precautions.
• Inspect the Chainsaw: Before each use, inspect the chainsaw for any damage or loose parts. Check the chain tension, oil level, and fuel level.
• Clear the Work Area: Remove any obstacles from the work area, such as branches, rocks, and debris.
• Establish an Escape Route: Before starting the chainsaw, identify a clear escape route in case of an emergency.
• Use Proper Stance: Stand with your feet shoulder-width apart and maintain a balanced stance.
• Keep a Firm Grip: Hold the chainsaw firmly with both hands.
• Avoid Kickback: Kickback is a sudden and forceful upward or backward movement of the chainsaw that can cause serious injury. To avoid kickback, keep the nose of the bar from contacting any solid object. Always cut below shoulder height.
• Never Cut Overhead: Cutting overhead is extremely dangerous and should be avoided at all costs.
• Shut Off the Chainsaw: Turn off the chainsaw before setting it down or moving to a new location.
• Refuel Safely: Refuel the chainsaw in a well-ventilated area, away from sparks or flames. Allow the engine to cool down before refueling.
• First Aid Kit: Always have a well stocked first aid kit nearby.

Pro Tip #2: Sharpening and Maintaining Your Chain

A sharp chain is essential for efficient and safe woodcutting. A dull chain requires more force to cut, increasing the risk of kickback and operator fatigue. Regular chain sharpening is crucial.

Identifying a Dull Chain

• Sawdust Instead of Chips: A sharp chain produces long, thin chips of wood. A dull chain produces fine sawdust.
• Increased Pressure Required: A dull chain requires more pressure to cut through wood.
• Smoking Chain: A dull chain can cause the chain and bar to overheat and smoke.
• Uneven Cutting: A dull chain may cut unevenly or pull to one side.

Sharpening Tools and Techniques

• Round File: Use a round file of the correct diameter for your chain’s pitch. For the Stihl 172’s 3/8″ P chain, a 5/32″ file is typically used.
• File Guide: A file guide helps you maintain the correct filing angle and depth.
• Flat File: Use a flat file to adjust the depth gauges (rakers).
• Vise: A vise securely holds the chainsaw bar while you sharpen the chain.
• Marking Pen: Use a marking pen to mark the cutters you’ve already sharpened.

Sharpening Procedure

1. Secure the Bar: Place the chainsaw bar in a vise.
2. Identify the Correct Filing Angle: The correct filing angle is typically marked on the chain or in the owner’s manual. For Stihl chains, it’s often around 30 degrees.
3. File the Cutters: Using the round file and file guide, file each cutter until it is sharp. Maintain a consistent angle and depth. File from the inside of the cutter to the outside.
4. Adjust the Depth Gauges (Rakers): After sharpening the cutters, check the depth gauges. The depth gauges should be slightly lower than the cutters. Use the flat file to lower the depth gauges if necessary. Use a depth gauge tool to ensure consistent height.
5. Repeat: Repeat the sharpening process for all the cutters on the chain.
6. Check Chain Tension: After sharpening, check the chain tension and adjust as needed.

I’ve found that using a chainsaw chain sharpener can greatly improve the speed and accuracy of chain sharpening. These tools use a grinding wheel to sharpen the cutters and can be adjusted to maintain the correct angles.

Chain Maintenance Tips

• Clean the Chain Regularly: Remove sawdust and debris from the chain after each use.
• Lubricate the Chain: Ensure that the chain is properly lubricated during operation. Check the oil level in the oil tank regularly.
• Check Chain Tension: Check the chain tension before each use and adjust as needed. A properly tensioned chain should have a slight amount of slack but should not be able to be pulled away from the bar more than about 1/8 inch.
• Replace Worn Chains: Replace the chain when it is worn or damaged. A worn chain will not cut efficiently and can be dangerous.

Pro Tip #3: Selecting the Right Wood

The type of wood you’re cutting significantly impacts the ease and efficiency of the process. Understanding the properties of different wood types is crucial.

Green Wood vs. Seasoned Wood

• Green Wood: Freshly cut wood that contains a high moisture content. Green wood is generally easier to split than seasoned wood but is heavier and more difficult to burn.
• Seasoned Wood: Wood that has been allowed to dry for several months or years. Seasoned wood is lighter, easier to ignite, and burns more efficiently.

Common Wood Types and Their Properties

• Hardwoods: Deciduous trees such as oak, maple, ash, and birch. Hardwoods are denser than softwoods and produce more heat when burned. They also take longer to season.
• Softwoods: Coniferous trees such as pine, fir, spruce, and cedar. Softwoods are less dense than hardwoods and burn more quickly. They are also easier to ignite.

Here’s a breakdown of some common wood types and their properties relevant to firewood:

Wood Selection Strategies

• Consider Your Heating Needs: If you need a long-lasting fire, choose hardwoods. If you need a quick fire for kindling, choose softwoods.
• Choose Locally Available Wood: Select wood types that are readily available in your area.
• Avoid Rotten or Decayed Wood: Rotten wood is difficult to split and burns poorly.
• Prioritize Seasoned Wood: Seasoned wood is easier to handle and burns more efficiently.

I once made the mistake of trying to burn green oak. It was incredibly difficult to ignite and produced very little heat. I learned my lesson and now always ensure that my firewood is properly seasoned.

Pro Tip #4: Efficient Felling and Bucking Techniques

Felling and bucking are essential steps in firewood preparation. Proper techniques can improve efficiency and reduce the risk of injury.

Felling Techniques

Felling is the process of cutting down a tree. It’s a dangerous task that should only be performed by experienced individuals.

1. Assess the Tree: Before felling a tree, assess its size, lean, and any potential hazards, such as branches or power lines.
2. Plan the Felling Direction: Determine the direction in which you want the tree to fall. Consider the natural lean of the tree, wind direction, and any obstacles in the area.
3. Clear the Area: Remove any obstacles from the felling area, such as branches, rocks, and debris.
4. Make the Notch Cut: The notch cut is a V-shaped cut that directs the tree’s fall. It should be made on the side of the tree facing the desired felling direction. The notch should be about one-third of the tree’s diameter.
5. Make the Back Cut: The back cut is made on the opposite side of the tree from the notch cut. It should be slightly higher than the notch cut and should leave a hinge of wood to control the tree’s fall.
6. Use Wedges: If the tree is leaning in the wrong direction, use wedges to help direct its fall.
7. Monitor the Tree: As you make the back cut, monitor the tree for any signs of movement.
8. Retreat Safely: Once the tree starts to fall, retreat quickly and safely away from the tree.

Bucking Techniques

Bucking is the process of cutting a felled tree into shorter lengths.

1. Choose a Safe Location: Buck the tree in a safe location, away from any obstacles or hazards.
2. Support the Log: Support the log with branches or other logs to prevent it from pinching the chain.
3. Use Proper Stance: Stand with your feet shoulder-width apart and maintain a balanced stance.
4. Cut from the Top: Cut from the top of the log to avoid pinching the chain.
5. Roll the Log: If necessary, roll the log to cut from the other side.
6. Avoid Cutting into the Ground: Avoid cutting into the ground, as this can damage the chain.
7. Cut to Desired Length: Cut the log into the desired length for firewood. I typically cut my firewood into 16-inch lengths, as this is a good size for my wood stove.

Log Splitting Techniques and Tools

Splitting logs efficiently is crucial for firewood preparation. Several tools and techniques can make this process easier and safer.

• Manual Splitting:

  • Axe Selection: A splitting axe with a heavy head (6-8 lbs) and a long handle (36 inches) is ideal for splitting logs. The weight and length provide leverage and power.
  • Splitting Technique: Place the log on a solid base, such as a chopping block. Position your feet shoulder-width apart and grip the axe handle firmly. Swing the axe with controlled power, aiming for the center of the log.
  • Wedges: For particularly tough or knotted logs, use splitting wedges. Drive the wedge into the log with a sledgehammer to create a split.

  • Hydraulic Log Splitters:

  • Types: Hydraulic log splitters come in various sizes and power ratings, from small electric models to large gas-powered units.

  • Operation: Place the log on the splitter’s bed and activate the hydraulic ram. The ram pushes the log against a wedge, splitting it in half.
  • Benefits: Hydraulic log splitters significantly reduce the physical effort required for splitting logs. They are ideal for processing large quantities of firewood.

  • Safety Considerations:

  • Wear Safety Glasses: Protect your eyes from flying wood chips.
  • Use Proper Footwear: Wear steel-toed boots to protect your feet.
  • Maintain a Safe Distance: Keep bystanders at a safe distance from the splitting area.
  • Follow Manufacturer’s Instructions: Read and follow the manufacturer’s instructions for operating any log splitting equipment.

Case Study: Optimizing Firewood Production

I once worked with a small-scale firewood business that was struggling to meet demand. By implementing more efficient felling and bucking techniques, as well as investing in a hydraulic log splitter, we were able to significantly increase their production capacity. We also implemented a better seasoning process, which improved the quality of their firewood.

Pro Tip #5: Firewood Seasoning and Storage

Proper seasoning and storage are essential for ensuring that your firewood burns efficiently and cleanly.

Seasoning Firewood

• Splitting: Split the firewood into smaller pieces to increase the surface area exposed to air.
• Stacking: Stack the firewood in a single row, with air gaps between the pieces. This allows for better air circulation.
• Location: Store the firewood in a sunny, well-ventilated location.
• Elevated: Elevate the firewood off the ground to prevent moisture from wicking up from the soil.
• Covering: Cover the top of the firewood pile to protect it from rain and snow, but leave the sides open for ventilation.
• Time: Allow the firewood to season for at least six months, or preferably longer. Hardwoods may require up to two years to season properly.

Determining Seasoning Time

• Moisture Meter: Use a moisture meter to check the moisture content of the firewood. Firewood is considered seasoned when its moisture content is below 20%. I’ve found that a moisture meter is an invaluable tool for ensuring that my firewood is properly seasoned.
• Visual Inspection: Seasoned firewood will be lighter in color and will have cracks in the ends.
• Sound: Seasoned firewood will make a hollow sound when struck together.

Firewood Storage

• Dry Location: Store the seasoned firewood in a dry location, away from moisture.
• Elevated: Elevate the firewood off the ground to prevent moisture from wicking up from the soil.
• Covered: Cover the firewood pile to protect it from rain and snow.
• Ventilation: Ensure that the firewood pile has adequate ventilation to prevent mold and mildew growth.

Firewood Stacking Methods

Proper firewood stacking not only ensures efficient drying but also adds to the aesthetic appeal of your woodpile. Here are a few methods I’ve found effective:

• Traditional Row Stacking: This is the most common method, where firewood is stacked in neat rows, typically with the cut ends facing outward. It’s simple, allows for good air circulation, and is easy to manage.
• Circular Stacking (Holz Hausen): This method involves stacking firewood in a circular structure with a slightly inward slope. The center is left hollow for ventilation. The circular shape sheds water effectively, and the inward slope helps stabilize the pile. This method is visually appealing and promotes excellent drying.
• Crib Stacking: This method involves creating a crib-like structure by alternating layers of firewood at right angles. This creates a sturdy and self-supporting stack that is ideal for windy locations.
• Pallet Stacking: Using pallets as a base elevates the firewood off the ground, preventing moisture absorption. This method is simple, cost-effective, and allows for easy relocation of the woodpile.

Case Study: Enhancing Firewood Drying

I conducted an experiment to compare the drying rates of firewood stacked using different methods. I stacked oak firewood using traditional row stacking, circular stacking (Holz Hausen), and pallet stacking. I monitored the moisture content of the firewood over a period of six months. The results showed that the circular stacking method resulted in the fastest drying rate, followed by pallet stacking and traditional row stacking. This was likely due to the improved air circulation and water shedding properties of the circular stack.

Conclusion: Putting It All Together

Mastering the Stihl 172 chainsaw and implementing these pro tips will significantly improve your woodcutting and firewood preparation efficiency. Remember, safety should always be your top priority. By following safe operating procedures, maintaining your chainsaw properly, selecting the right wood, using efficient felling and bucking techniques, and properly seasoning and storing your firewood, you can enjoy the benefits of a warm fire and the satisfaction of a job well done.

Next Steps

• Review the Stihl 172 Owner’s Manual: Familiarize yourself with the chainsaw’s features, operation, and safety precautions.
• Practice Chainsaw Safety: Practice safe operating procedures in a controlled environment.
• Sharpen Your Chain: Learn how to sharpen your chain properly.
• Experiment with Different Wood Types: Learn about the properties of different wood types and how they affect firewood performance.
• Try Different Felling and Bucking Techniques: Experiment with different techniques to find what works best for you.
• Implement a Firewood Seasoning and Storage Plan: Develop a plan for seasoning and storing your firewood properly.

Wood processing and firewood preparation are rewarding activities that connect you to nature and provide a valuable resource for heating your home. With the right knowledge, skills, and tools, you can enjoy the benefits of a warm fire and the satisfaction of a job well done. The Stihl 172 is a great tool to get you started.

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