151 Stihl Chainsaw Review (5 Expert Tips For Lightweight Use)

Ever felt like wrestling a wild boar when all you wanted was a cozy fire? That’s how some chainsaws feel – overpowered, unwieldy, and frankly, a pain in the back. But what if you could tame that beast? What if you could wield a chainsaw with the grace of a seasoned woodcutter, turning logs into firewood with ease? That’s the promise of the Stihl MS 151, a lightweight wonder that often gets overlooked. But is it all hype? Let’s dive deep, break it down, and see if this little saw can truly deliver. This isn’t just another spec sheet regurgitation; I’m sharing my personal experience, hard-won insights, and pro tips to help you make the most of this tool.

The Stihl MS 151: A Lightweight Champion?

The Stihl MS 151 is marketed as a lightweight, entry-level chainsaw, perfect for homeowners and occasional users. But don’t let the “entry-level” tag fool you. It’s a capable machine when used correctly. My first experience with the MS 151 was clearing brush around my property. I was initially skeptical – I’m used to larger, more powerful saws. However, I was immediately impressed by its maneuverability and how little fatigue I felt after a couple of hours of work. It’s like trading a sledgehammer for a well-balanced hatchet – different tools for different jobs.

Unveiling the Specs: What Makes it Tick?

Before we get into the nitty-gritty, let’s look at the specifications. This is where the rubber meets the road, and understanding these numbers is crucial to making an informed decision.

Engine Displacement: 23.6 cc
Power Output: 1.2 kW (1.6 bhp)
Weight (without bar and chain): 2.8 kg (6.2 lbs) – This is the key selling point!
Powerhead Weight (lbs): 6.2
Fuel Tank Capacity: 0.27 liters
Oil Tank Capacity: 0.21 liters
Guide Bar Lengths (Recommended): 12-14 inches
Chain Pitch: 3/8″ P (Picco)
Oilomatic Chain Type: Picco Micro 3 (PM3)
Sound Pressure Level: 99 dB(A)
Sound Power Level: 111 dB(A)
Vibration Level Left/Right: 5.2/5.5 m/s²

Key Takeaways:

Lightweight Design: The 2.8 kg weight is truly remarkable. It’s significantly lighter than many comparable chainsaws, making it ideal for extended use and users with less upper body strength.
Smaller Engine: The 23.6 cc engine is sufficient for light-duty tasks but will struggle with larger diameter logs.
Recommended Bar Length: Sticking to the recommended 12-14 inch bar length is crucial for optimal performance and safety.

5 Expert Tips for Lightweight Use: Taming the Beast

Here are my top 5 tips to maximize the MS 151’s potential and ensure a lightweight, efficient, and safe experience:

1. Chain Selection and Sharpening: The Key to Effortless Cutting

The chain is the unsung hero of any chainsaw. A dull chain makes even the lightest saw feel like a lead weight. The MS 151 uses a 3/8″ Picco Micro 3 (PM3) chain, which is designed for smooth, clean cuts.

Sharpening Frequency: I recommend sharpening the chain after every 2-3 tanks of fuel, or more frequently if you’re cutting dirty or abrasive wood. A sharp chain requires less force, reducing fatigue and extending the life of the saw.
Sharpening Angle: Maintain the correct sharpening angle (typically 30 degrees) using a file guide. Incorrect angles can lead to aggressive cutting or premature chain wear.
Raker Depth: Check the raker depth (the “depth gauge” in front of each cutting tooth). If the rakers are too high, the chain won’t bite effectively. Use a raker gauge and file to maintain the correct depth.
Chain Tension: Proper chain tension is crucial for safety and performance. A loose chain can derail, causing injury. A tight chain can overheat and damage the bar and sprocket. Aim for a tension where you can pull the chain about 1/8 inch away from the bar in the middle.

Data Point: A study by Oregon Products found that using a properly sharpened chain can reduce cutting time by up to 30% and fuel consumption by up to 15%.

2. Wood Selection: Know Your Limits

The MS 151 is not designed for felling large trees or bucking massive logs. It excels at smaller tasks like pruning, limbing, and cutting firewood from smaller diameter wood.

Diameter Limit: I’ve found that the MS 151 performs best with wood up to 6-8 inches in diameter. While it can handle larger diameters, it will take significantly longer and put more strain on the engine.
Wood Type: Softwoods like pine and fir are easier to cut than hardwoods like oak and maple. If you’re primarily cutting hardwoods, consider a larger, more powerful chainsaw.
Moisture Content: Green wood (freshly cut) is often easier to cut than dry wood, but it’s also heavier. Seasoned firewood (dried for 6-12 months) is lighter and burns more efficiently.
Avoid Dirty Wood: Avoid cutting wood that is covered in dirt, sand, or bark. These abrasive materials will quickly dull the chain.

Data Point: The moisture content of green wood can be as high as 50-60%, while seasoned firewood should have a moisture content of 20% or less for optimal burning.

3. Proper Cutting Techniques: Let the Saw Do the Work

Using the correct cutting techniques can significantly reduce fatigue and improve cutting efficiency.

Avoid Pinching: Pinching occurs when the weight of the log closes the cut, trapping the chain. Use wedges or make relief cuts to prevent pinching.
Use the Bumper Spikes: The bumper spikes (also known as felling dogs) provide leverage and stability. Dig the spikes into the wood and pivot the saw to make the cut.
Maintain a Steady Pace: Don’t force the saw. Let the chain do the work. Apply gentle pressure and maintain a steady pace.
Avoid Kickback: Kickback is a dangerous phenomenon that occurs when the tip of the bar contacts an object, causing the saw to jump back towards the operator. Always be aware of the tip of the bar and avoid cutting with it. Use a reduced-kickback chain and bar for added safety.
Limbing Safely: When limbing, always stand on the uphill side of the log and cut away from your body. Be aware of the potential for branches to spring back.

Data Point: Kickback is the leading cause of chainsaw-related injuries. According to the Consumer Product Safety Commission, there are approximately 30,000 chainsaw-related injuries each year in the United States.

4. Ergonomics and Posture: Save Your Back

Even with a lightweight chainsaw, proper ergonomics are essential to prevent fatigue and injury.

Maintain a Good Stance: Stand with your feet shoulder-width apart and your knees slightly bent. This will provide a stable base and allow you to absorb the vibrations of the saw.
Keep Your Back Straight: Avoid bending or twisting your back. Use your legs and arms to move the saw.
Take Breaks: Take frequent breaks to rest and stretch. Even a few minutes of rest can make a big difference.
Use Proper Lifting Techniques: When lifting logs, bend your knees and keep your back straight. Avoid lifting heavy loads alone.
Consider Anti-Vibration Gloves: Anti-vibration gloves can help reduce the impact of vibrations on your hands and wrists, reducing fatigue and the risk of developing hand-arm vibration syndrome (HAVS).

Data Point: Hand-arm vibration syndrome (HAVS) is a condition caused by prolonged exposure to vibrations, which can lead to numbness, tingling, and pain in the hands and fingers.

5. Maintenance and Storage: Keep it Running Smoothly

Regular maintenance is crucial for keeping the MS 151 running smoothly and extending its lifespan.

Clean the Air Filter: A dirty air filter restricts airflow and reduces engine performance. Clean the air filter after every use.
Clean the Spark Plug: A fouled spark plug can cause starting problems and poor performance. Clean or replace the spark plug as needed.
Check the Fuel and Oil Levels: Always check the fuel and oil levels before starting the saw. Use the correct fuel mixture (typically 50:1 ratio of gasoline to two-stroke oil).
Sharpen the Chain Regularly: A dull chain puts extra strain on the engine and reduces cutting efficiency.
Clean the Bar and Sprocket: Remove sawdust and debris from the bar and sprocket after each use.
Store the Saw Properly: Store the saw in a dry, well-ventilated area. Drain the fuel tank before storing the saw for extended periods. Use a bar cover to protect the chain and bar.
Check Chain Oiler: Ensure the chain oiler is functioning correctly. A dry chain will quickly overheat and wear out.

Data Point: Regular maintenance can extend the lifespan of a chainsaw by up to 50%.

Case Study: MS 151 vs. Brush Clearing Project

I recently used the MS 151 on a brush clearing project at a friend’s property. The project involved removing overgrown shrubs, small trees (up to 6 inches in diameter), and fallen branches.

Challenge: The terrain was uneven and rocky, making it difficult to maneuver with a larger chainsaw.
Solution: The MS 151’s lightweight design and maneuverability proved to be a significant advantage. I was able to easily navigate the terrain and reach tight spaces.
Results: I was able to clear the brush in approximately half the time it would have taken with a larger chainsaw. I also experienced significantly less fatigue.
Lessons Learned: The MS 151 is an excellent tool for brush clearing and other light-duty tasks. However, it’s important to use the correct cutting techniques and avoid pushing the saw beyond its limits.

Safety First: A Non-Negotiable

Chainsaw safety is paramount. No matter how lightweight the saw, the risks are real. Always wear appropriate safety gear, including:

Eye Protection: Safety glasses or a face shield to protect your eyes from flying debris.
Hearing Protection: Earplugs or earmuffs to protect your hearing from the loud noise of the chainsaw.
Gloves: Heavy-duty gloves to protect your hands from cuts and vibrations.
Chaps: Chainsaw chaps to protect your legs from cuts.
Steel-Toed Boots: Steel-toed boots to protect your feet from falling logs and other hazards.
Helmet: A helmet to protect your head from falling branches.

Data Point: According to the Centers for Disease Control and Prevention (CDC), approximately 20% of chainsaw-related injuries involve the head or face.

Understanding Wood: A Mini-Course

To truly master wood processing, understanding wood itself is essential. Here’s a breakdown of key factors:

Hardwood vs. Softwood

Hardwoods: Generally deciduous trees (lose leaves annually) like oak, maple, ash. Denser, burn longer, produce more heat, and require more effort to cut.
- Oak: High density (approx. 0.75 g/cm³), excellent heat output (around 28 million BTU per cord).
- Maple: Density around 0.63 g/cm³, good heat output (around 24 million BTU per cord).
Softwoods: Generally coniferous trees (evergreens) like pine, fir, spruce. Less dense, burn faster, produce less heat, and easier to cut.
- Pine: Low density (approx. 0.4 g/cm³), lower heat output (around 20 million BTU per cord).
- Fir: Density around 0.45 g/cm³, moderate heat output (around 22 million BTU per cord).

Moisture Content and Drying

Green Wood: High moisture content (50-60%), difficult to ignite, produces excessive smoke, and low heat output.
Seasoned Wood: Low moisture content (20% or less), easy to ignite, burns cleanly, and high heat output.
Drying Time: Depends on wood type, climate, and stacking method. Generally, hardwoods take 12-24 months to season, while softwoods take 6-12 months.
Stacking Method: Stack wood in a single row, off the ground, with good air circulation. Cover the top to protect from rain and snow.
Moisture Meter: Use a moisture meter to check the moisture content of firewood before burning.

Data Point: Burning seasoned firewood with a moisture content of 20% or less can increase heat output by up to 50% compared to burning green wood.

Tool Calibration Standards: Keeping It Precise

Proper tool calibration is vital for efficient and safe operation.

Chainsaw Calibration

Idle Speed: Adjust the idle speed screw to ensure the chain does not move when the engine is idling.
High-Speed Adjustment: Adjust the high-speed screw to optimize engine performance at full throttle.
Carburetor Adjustment: A properly adjusted carburetor ensures the correct air-fuel mixture, maximizing power and fuel efficiency.
Chain Tension: Check and adjust chain tension regularly. A loose chain can derail, while a tight chain can overheat and damage the bar and sprocket.
Chain Sharpness: Sharpen the chain regularly to maintain optimal cutting performance.
Bar Oiler: Ensure the bar oiler is functioning correctly to keep the chain lubricated.

Measuring Tools

Tape Measure: Use a tape measure to accurately measure log lengths and diameters.
Moisture Meter: Use a moisture meter to check the moisture content of firewood.
Scales: Use scales to weigh firewood and determine its density.

Data Point: A properly calibrated chainsaw can reduce fuel consumption by up to 10% and extend the life of the engine.

Safety Equipment Requirements: No Compromises

Safety equipment is not optional. It is essential for preventing injuries.

Personal Protective Equipment (PPE)

Helmet: Protects your head from falling branches and other hazards.
Eye Protection: Protects your eyes from flying debris.
Hearing Protection: Protects your hearing from the loud noise of the chainsaw.
Gloves: Protects your hands from cuts and vibrations.
Chaps: Protects your legs from cuts.
Steel-Toed Boots: Protects your feet from falling logs and other hazards.

Chainsaw Safety Features

Chain Brake: Stops the chain immediately in case of kickback.
Throttle Lockout: Prevents accidental throttle activation.
Chain Catcher: Catches the chain if it derails.
Anti-Vibration System: Reduces vibrations to minimize fatigue and the risk of HAVS.

Data Point: Wearing appropriate PPE can reduce the risk of chainsaw-related injuries by up to 80%.

Log Dimensions and Cord Volumes: Getting the Numbers Right

Understanding log dimensions and cord volumes is crucial for firewood production.

Log Dimensions

Diameter: Measure the diameter of the log at both ends and in the middle. Use the average diameter to calculate the volume.
Length: Measure the length of the log accurately.
Volume: Calculate the volume of the log using the formula: Volume = π * (diameter/2)² * length

Cord Volumes

Cord: A cord is a stack of wood that measures 4 feet high, 4 feet wide, and 8 feet long, totaling 128 cubic feet.
Face Cord: A face cord is a stack of wood that measures 4 feet high and 8 feet long, but the width can vary.
Calculating Cord Volume: To calculate the volume of a stack of wood, multiply the height, width, and length.

Data Point: A cord of seasoned hardwood can weigh between 2,000 and 4,000 pounds, depending on the wood type and moisture content.

Wood Strength and Drying Tolerances: Mastering the Material

Understanding wood strength and drying tolerances is essential for building projects and ensuring the longevity of wooden structures.

Wood Strength

Tensile Strength: The ability of wood to resist being pulled apart.
Compressive Strength: The ability of wood to resist being crushed.
Bending Strength: The ability of wood to resist bending under load.
Shear Strength: The ability of wood to resist being sheared apart.

Drying Tolerances

Shrinkage: Wood shrinks as it dries. The amount of shrinkage varies depending on the wood type and moisture content.
Warping: Wood can warp as it dries, due to uneven shrinkage.
Cracking: Wood can crack as it dries, especially if it dries too quickly.
Optimal Moisture Content: The optimal moisture content for wood used in construction is typically between 6% and 12%.

Data Point: Wood shrinks approximately 1% for every 4% change in moisture content below the fiber saturation point (around 30%).

Conclusion: The MS 151 – A Niche Performer

The Stihl MS 151 is not a powerhouse, but it’s a surprisingly capable tool when used within its limitations. Its lightweight design makes it ideal for light-duty tasks, users with less upper body strength, and situations where maneuverability is key. By following these expert tips, you can maximize the MS 151’s potential and enjoy a lightweight, efficient, and safe wood processing experience. Remember to always prioritize safety and maintain your equipment properly. Now, go forth and conquer that woodpile! Just remember to keep that chain sharp!