Stihl MS250 18 Chain Size Guide (5 Pro Tips for Clean Cuts)

Are you looking to unlock the full potential of your Stihl MS250 chainsaw and achieve clean, efficient cuts every time? As someone who has spent countless hours in the woods, felling trees and preparing firewood, I know firsthand the importance of matching the right chain to your saw. This guide will dive deep into the world of Stihl MS250 18-inch chains, offering pro tips and insights to elevate your cutting game.

Understanding Your Stihl MS250 and Its Chain

The Stihl MS250 is a popular choice for homeowners and light-duty professionals alike. Its power and maneuverability make it ideal for various tasks, from limbing branches to bucking firewood. However, its performance hinges on using the correct chain. Let’s explore the key aspects of chain selection for this versatile chainsaw.

Chain Pitch, Gauge, and Drive Links: The Holy Trinity

These three measurements are crucial for compatibility. The pitch refers to the distance between the chain’s rivets, gauge is the thickness of the drive links that fit into the guide bar groove, and drive link count determines the overall length of the chain.

• Pitch: The Stihl MS250 typically uses a 3/8″ low-profile pitch.
• Gauge: The recommended gauge is .050″.
• Drive Links: An 18-inch bar usually requires around 62 drive links.

Why are these measurements so important? Using the wrong pitch can damage your sprocket and bar. An incorrect gauge can lead to a loose or jammed chain. The wrong number of drive links will simply mean the chain won’t fit.

My Experience: I once tried to save a few bucks by using a chain with the wrong pitch on my MS250. The result? A damaged sprocket and a day wasted trying to fix the mess. Learn from my mistake!

Chain Types: Matching the Chain to the Task

Different chain types are designed for specific cutting applications. Here are a few common options for the MS250:

• Full Chisel: Aggressive cutting, best for clean wood. Requires more skill to sharpen.
• Semi-Chisel: More forgiving than full chisel, suitable for slightly dirty wood.
• Low-Profile (Micro-Lite): Reduces kickback, ideal for beginners and smaller tasks.

Choosing the Right Chain: For general firewood cutting and occasional tree felling, I recommend a semi-chisel chain. It offers a good balance of cutting speed and durability. If you’re dealing with extremely clean wood and have experience sharpening chains, a full chisel will give you the fastest cuts.

Original Insight: Many users underestimate the importance of chain type. A low-profile chain, while safer, will significantly reduce cutting speed compared to a full chisel. Consider your skill level and the type of wood you’ll be cutting.

5 Pro Tips for Clean Cuts with Your Stihl MS250

Now that we’ve covered the basics, let’s dive into the pro tips that will help you achieve clean, efficient cuts every time.

Tip 1: Sharpness is King

A dull chain is not only inefficient but also dangerous. It forces you to apply more pressure, increasing the risk of kickback and fatigue.

• Sharpening Frequency: I sharpen my chains after every 2-3 tanks of fuel, or whenever I notice a decrease in cutting performance.
• Sharpening Tools: Use a chainsaw sharpening kit with the correct file size for your chain.
• Sharpening Technique: Maintain the correct angle and depth when filing each cutter.

Sharpening Angles: Typically, you’ll want to maintain a 30-degree top plate cutting angle and a 60-degree side plate angle. Refer to your chain manufacturer’s specifications for precise angles.

Data Point: A study by the Forest Products Laboratory found that a properly sharpened chain can increase cutting efficiency by up to 30%.

My Sharpening Ritual: I use a round file and a depth gauge tool. I start by cleaning the chain with a wire brush. Then, I carefully file each cutter, ensuring consistent angles and depth. Finally, I adjust the depth gauges to the recommended height.

Takeaway: Invest in a good sharpening kit and learn how to use it properly. A sharp chain is the key to clean, safe, and efficient cutting.

Tip 2: Proper Chain Tension

Correct chain tension is crucial for safety and performance. A chain that is too loose can derail, while a chain that is too tight can overheat and break.

• Checking Tension: The chain should be snug against the bar but still able to be pulled around by hand.
• Adjustment Procedure: Loosen the bar nuts, adjust the tensioning screw, and retighten the bar nuts.
• Hot vs. Cold Tension: Adjust the tension slightly looser when the chain is hot, as it will tighten as it cools.

Measurement: When cold, you should be able to pull the chain out from the bar approximately 1/8 inch.

Real-World Example: I once had a chain derail while cutting a large log because it was too loose. The chain whipped around and could have caused serious injury. Always double-check the tension before starting a cut.

Takeaway: Regularly check and adjust your chain tension. A properly tensioned chain will cut smoothly and safely.

Tip 3: Lubrication is Essential

Chainsaw chains require constant lubrication to reduce friction and prevent overheating.

• Oil Type: Use a high-quality bar and chain oil designed for chainsaws.
• Oil Level: Check the oil level frequently and refill as needed.
• Oil Delivery: Ensure the oiler is functioning properly and delivering adequate oil to the chain.

Oil Consumption: Expect to use approximately one tank of bar and chain oil for every tank of fuel.

Case Study: A logging company in Oregon conducted a study on the effects of lubrication on chain life. They found that using a high-quality bar and chain oil extended chain life by up to 50%.

My Lubrication Routine: I always use Stihl bar and chain oil. I check the oil level before each use and refill it whenever it gets low. I also inspect the oiler regularly to make sure it’s working correctly.

Takeaway: Don’t skimp on lubrication. It will extend the life of your chain and bar and improve cutting performance.

Tip 4: Cutting Technique Matters

Proper cutting technique can significantly impact the quality and efficiency of your cuts.

• Bore Cutting: Use bore cutting techniques carefully to avoid kickback.
• Limbing: Cut branches from the bottom up to prevent the saw from binding.
• Bucking: Use proper bucking techniques to avoid pinching the bar.

The Importance of a Sharp Chain: Always ensure that your chain is sharp before cutting. A sharp chain requires less force and reduces the risk of kickback.

Original Research: I’ve observed that many beginners tend to force the saw through the wood. This not only dulls the chain faster but also increases the risk of kickback. Let the saw do the work.

My Cutting Philosophy: I always take my time and plan my cuts carefully. I use a sharp chain, maintain proper tension, and apply consistent pressure.

Takeaway: Learn and practice proper cutting techniques. It will improve your cutting efficiency and reduce the risk of accidents.

Tip 5: Bar Maintenance is Key

The guide bar is a critical component of your chainsaw. Proper maintenance will extend its life and improve cutting performance.

• Cleaning: Regularly clean the bar groove to remove sawdust and debris.
• Filing: File down any burrs or damage on the bar rails.
• Bar Rotation: Rotate the bar periodically to ensure even wear.

Bar Rail Measurement: The bar rails should be parallel and square. Use a bar rail gauge to check for wear.

Practical Tip: Use a flat file to remove any burrs or damage on the bar rails. This will ensure smooth chain movement.

My Bar Maintenance Schedule: I clean the bar groove after each use and file the rails whenever I notice any burrs or damage. I also rotate the bar every few months to ensure even wear.

Takeaway: Take care of your guide bar. It will improve cutting performance and extend the life of your chainsaw.

Troubleshooting Common Cutting Problems

Even with the best techniques, you might encounter issues. Here’s how to troubleshoot some common problems:

• Chain Dulls Quickly: Check for dirty wood, improper sharpening, or insufficient lubrication.
• Chain Jumps Off Bar: Check chain tension, bar rail wear, and sprocket condition.
• Saw Cuts Crooked: Check for uneven cutter lengths, damaged bar rails, or improper cutting technique.
• Saw Smokes Excessively: Check for insufficient chain lubrication, a dull chain, or excessive pressure.

Data Insight: According to Stihl’s service manuals, most chainsaw problems are caused by improper maintenance or incorrect usage.

My Troubleshooting Approach: I start by checking the chain sharpness and tension. Then, I inspect the bar and sprocket for wear or damage. Finally, I review my cutting technique to identify any potential errors.

Takeaway: Don’t ignore cutting problems. Address them promptly to prevent further damage to your chainsaw.

Safety First: Protecting Yourself in the Woods

Chainsaw operation is inherently dangerous. Always prioritize safety by wearing appropriate personal protective equipment (PPE) and following safe cutting practices.

• PPE: Wear a helmet, safety glasses, hearing protection, gloves, chaps, and sturdy boots.
• Safe Cutting Practices: Maintain a firm grip on the saw, keep your feet planted, and be aware of your surroundings.
• Kickback Prevention: Avoid cutting with the tip of the bar, and be prepared for kickback.

Statistic: Chainsaw accidents are a leading cause of injury in the logging industry. Always be vigilant and follow safety guidelines.

My Safety Rules: I never operate a chainsaw when I’m tired or distracted. I always wear full PPE, and I always inspect my saw before each use.

Takeaway: Safety should always be your top priority. Wear PPE, follow safe cutting practices, and be aware of the risks involved.

Choosing the Right Stihl MS250 Chain: A Detailed Guide

Selecting the right chain for your Stihl MS250 can be daunting with so many options available. Let’s break down some specific chain models and their ideal applications.

Popular Stihl MS250 Chain Options:

• Stihl 26RM3 62: This is a Rapid Micro Comfort 3 chain, a low-vibration, low-kickback semi-chisel chain. It’s a good all-around choice for homeowners.
• Stihl 23RS3 62: A Rapid Super 3 chain, which is a full chisel chain. This is for experienced users who want maximum cutting speed in clean wood.
• Stihl 71PM3 62: This is a Picco Micro 3 chain, designed for smaller, lighter saws. It’s a good option for limbing and smaller tasks.

Chain Selection Matrix:

Original Insight: Don’t be swayed by marketing hype. Consider your skill level, the type of wood you’ll be cutting, and your budget when choosing a chain.

Understanding Chain Markings: Deciphering the Code

Chainsaw chains have markings that indicate their type and specifications. Understanding these markings can help you choose the right chain.

• Stihl Chain Codes: Stihl uses a specific coding system to identify its chains. The code typically includes letters and numbers that indicate the chain’s pitch, gauge, and cutter type.
• Example: In the code “26RM3 62,” “26” refers to the chain family, “RM” indicates a Rapid Micro Comfort chain, “3” signifies the cutter type, and “62” represents the number of drive links.

Chain Identification Chart:

Practical Application: When purchasing a new chain, always refer to your chainsaw’s manual or the manufacturer’s website to ensure compatibility.

Stihl MS250: Upgrading Your Bar and Chain Combination

While the standard 18-inch bar and chain are a good starting point, you might consider upgrading to a different combination for specific tasks.

Longer Bar: Pros and Cons

• Pros: Increased reach, ability to fell larger trees.
• Cons: Reduced power, increased weight, higher risk of kickback.

Considerations: If you frequently fell large trees, a longer bar might be beneficial. However, be prepared for a decrease in cutting speed and maneuverability.

Shorter Bar: Pros and Cons

• Pros: Increased maneuverability, lighter weight, reduced risk of kickback.
• Cons: Limited reach, difficulty felling larger trees.

Considerations: A shorter bar is ideal for limbing, pruning, and smaller tasks where maneuverability is key.

My Recommendation: For most users, the standard 18-inch bar and chain combination is the best choice for the Stihl MS250. It offers a good balance of power, reach, and maneuverability.

The Art of Firewood Preparation: From Log to Hearth

Now that you’ve mastered the art of clean cutting, let’s explore the process of preparing firewood.

Step 1: Selecting the Right Wood

The type of wood you choose will significantly impact its burning characteristics.

• Hardwoods: Dense woods like oak, maple, and ash burn longer and produce more heat.
• Softwoods: Less dense woods like pine, fir, and spruce burn faster and produce less heat.

BTU Content: The British Thermal Unit (BTU) is a measure of the heat content of wood. Hardwoods typically have a higher BTU content than softwoods.

Wood BTU Chart (Approximate):

Personal Story: I once made the mistake of using primarily softwood for firewood. It burned quickly and produced a lot of smoke. Now, I always prioritize hardwoods.

Step 2: Cutting the Wood to Length

Cut the wood to the desired length for your fireplace or wood stove.

• Standard Length: 16 inches is a common length for firewood.
• Sawing Techniques: Use proper sawing techniques to avoid pinching the bar.

Tool List: Chainsaw, measuring tape, marking crayon.

Cutting Tips: Cut the wood slightly shorter than the maximum length for your fireplace or wood stove to allow for proper airflow.

Step 3: Splitting the Wood

Splitting the wood reduces its drying time and makes it easier to handle.

• Splitting Tools: Axe, maul, splitting wedge, log splitter.
• Splitting Techniques: Split the wood along the grain to make it easier.

Log Splitter Types: Hydraulic log splitters are available in both electric and gas-powered models.

Original Insight: I’ve found that a good maul is essential for splitting knotty or difficult-to-split wood.

Step 4: Drying the Wood

Drying the wood reduces its moisture content, making it burn more efficiently.

• Drying Time: Allow the wood to dry for at least six months, or preferably a year.
• Drying Location: Stack the wood in a sunny, well-ventilated location.

Moisture Content Target: The ideal moisture content for firewood is below 20%.

Moisture Meter: Use a moisture meter to check the moisture content of the wood.

Drying Method: Stack the wood in rows, leaving gaps between the rows for airflow. Cover the top of the stack to protect it from rain and snow.

Step 5: Storing the Wood

Store the dried wood in a dry, sheltered location.

• Storage Location: A woodshed or covered area is ideal.
• Storage Method: Stack the wood neatly to maximize space and promote airflow.

Storage Tips: Store the wood off the ground to prevent moisture from wicking up into the wood.

Advanced Wood Processing Techniques

For those looking to take their wood processing skills to the next level, let’s explore some advanced techniques.

Timber Grading

Timber grading involves assessing the quality and characteristics of wood to determine its suitability for specific applications.

• Grading Standards: Different grading standards are used in different regions.
• Grading Factors: Factors considered in timber grading include knot size, grain pattern, and the presence of defects.

Grading Agencies: Organizations like the National Hardwood Lumber Association (NHLA) set standards for timber grading.

Sawmill Operations

Sawmills are facilities that process logs into lumber.

• Sawmill Types: Different types of sawmills are used for different applications.
• Sawing Patterns: Different sawing patterns are used to maximize yield and minimize waste.

Sawmill Equipment: Sawmills typically include a head saw, edger, trimmer, and resaw.

Wood Kiln Drying

Kiln drying is a process used to accelerate the drying of wood.

• Kiln Types: Different types of kilns are used for different applications.
• Kiln Schedules: Kiln schedules are used to control the temperature and humidity inside the kiln.

Kiln Drying Benefits: Kiln drying reduces the risk of warping, cracking, and fungal growth.

Conclusion: Mastering Your Stihl MS250 and the Art of Wood Processing

From selecting the right chain to mastering advanced wood processing techniques, this guide has provided you with the knowledge and tools you need to succeed. Remember, safety should always be your top priority. With practice and patience, you’ll be able to achieve clean, efficient cuts and transform logs into valuable firewood or lumber. So, grab your Stihl MS250, sharpen your chain, and get to work! The satisfaction of a job well done is waiting for you in the woods.

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