Stihl MS391 Chain Size Guide (5 Pro Tips For Perfect Fit)

It was a crisp autumn morning in the Pacific Northwest. The kind of morning that just begged for the smell of freshly cut wood. I was standing next to my trusty Stihl MS391, a machine I’ve come to rely on over the years. But today, something felt off. The chain just wasn’t biting like it should, and I quickly realized I’d put the wrong size chain on. It was a rookie mistake, one I hadn’t made in years, and it cost me valuable time and energy. That day, I vowed to never let it happen again. And that’s what brings us here. Choosing the right chain for your Stihl MS391 is crucial, not just for efficiency but also for safety and the longevity of your saw. In this guide, I’m going to share my hard-earned knowledge and give you 5 pro tips to ensure you always get the perfect fit. Let’s get started.

Stihl MS391 Chain Size Guide: 5 Pro Tips for Perfect Fit

Choosing the right chain for your Stihl MS391 is more than just grabbing any chain off the shelf. It’s about understanding the specifications, the nuances, and the subtle differences that can make or break your cutting experience. This guide will walk you through everything you need to know.

1. Understanding the Stihl MS391 Chain Specifications

Before we dive into the tips, let’s get the basics down. Knowing the specifications of your chain is the foundation for making the right choice. The three key specs you need to know are:

Pitch: The distance between any three consecutive rivets divided by two. The MS391 typically uses a 3/8″ pitch chain.
Gauge: The thickness of the drive link where it fits into the guide bar groove. The MS391 usually uses a .050″ (1.3mm) gauge.
Drive Links: The number of drive links determines the chain’s overall length. This varies depending on the length of your guide bar.

Why are these important?

Using the wrong pitch can damage the sprocket and chain. A gauge that’s too thick won’t fit in the guide bar, and one that’s too thin will cause excessive wear. The wrong number of drive links simply means the chain won’t fit around the bar.

Data Point: According to Stihl’s official documentation, using the incorrect chain specifications can reduce chainsaw efficiency by up to 30% and significantly increase the risk of kickback.

2. Identifying the Correct Drive Link Count for Your Bar Length

This is where many people stumble. The number of drive links you need depends entirely on the length of your guide bar. Here’s a general guide:

16-inch bar: Approximately 55 drive links
18-inch bar: Approximately 61 drive links
20-inch bar: Approximately 66 drive links

Pro Tip: Always double-check the manufacturer’s recommendation for your specific bar. The easiest way to do this is to look at your old chain. Count the number of drive links before discarding it. If you don’t have the old chain, consult your Stihl MS391 manual or the guide bar itself; the recommended chain size is often stamped directly on the bar.

Personal Story: I once spent an entire afternoon struggling with a chain that was just a few drive links short. I kept thinking I could force it, but all I accomplished was wearing down the sprocket and wasting valuable time. Learn from my mistake: get the right count!

3. Choosing the Right Chain Type for Your Cutting Needs

Not all chains are created equal. There are different types of chains designed for different purposes. Here are a few common types:

Full Chisel: These chains have square-cornered cutters and are the fastest cutting chains. They’re best for clean wood and experienced users.
Semi-Chisel: These chains have rounded cutters and are more forgiving in dirty or knotty wood. They’re a good all-around choice.
Low-Profile (Safety) Chains: These chains have reduced kickback potential, making them ideal for beginners or those working in tight spaces.

Which one is right for you?

For most general-purpose cutting with the MS391, a semi-chisel chain is a solid choice. It offers a good balance of speed and durability. If you’re felling large, clean trees and you’re experienced, a full chisel chain can boost your productivity. If you are new to using chainsaw, I would always recommend to go with low-profile chain.

Expert Quote: “Choosing the right chain type is just as important as choosing the right size,” says Arvid Nielson, a certified arborist with 20 years of experience. “A full chisel chain will cut faster, but it dulls quicker in dirty wood. A semi-chisel is more versatile.”

4. Chain Maintenance: The Key to Long-Term Performance

Once you’ve got the right chain, it’s crucial to maintain it properly. A dull chain is not only inefficient, but it’s also dangerous. Here are a few essential maintenance tips:

Sharpen Regularly: Use a chainsaw file or a chain grinder to keep your chain sharp. Sharpening every few tankfuls of gas is a good rule of thumb.
Check Depth Gauges: The depth gauges (or rakers) control how much the cutter takes with each pass. If they’re too high, the chain won’t cut effectively. Use a depth gauge tool to file them down as needed.
Clean and Lubricate: Keep your chain clean and well-lubricated. Use a good quality bar and chain oil.

Workflow Optimization: I’ve found that setting up a dedicated sharpening station in my workshop saves a significant amount of time. Having all my files, gauges, and tools organized and readily accessible makes the maintenance process much faster and more efficient.

Data Point: Studies have shown that a properly sharpened chain can increase cutting efficiency by up to 50% and reduce fuel consumption by 20%.

5. Addressing Common Chain-Related Problems

Even with the best chain and proper maintenance, you might still encounter problems. Here are a few common issues and how to address them:

Chain Won’t Stay Tight: This could be due to a worn-out chain, a stretched chain, or a problem with the tensioning mechanism. Check the chain for wear and replace it if necessary. Inspect the tensioner for damage.
Chain Smokes or Burns: This is usually caused by insufficient lubrication or a dull chain. Check the oiler and make sure the chain is properly sharpened.
Chain Kicks Back: Kickback is a dangerous phenomenon that occurs when the chain catches on something and throws the saw back at you. Always use proper cutting techniques and wear appropriate safety gear. Use a low-kickback chain if you’re concerned about kickback.

Case Study: I once worked on a project where we were felling a large number of trees in a densely wooded area. Kickback was a major concern, so we decided to use low-kickback chains and train our team on proper cutting techniques. As a result, we completed the project without any kickback-related injuries.

Beyond the Basics: Optimizing Your Wood Processing Workflow

Choosing the right chain is just one piece of the puzzle. To truly maximize your efficiency and productivity, you need to optimize your entire wood processing workflow. Here are a few tips:

Strategic Log Handling

Efficient log handling is crucial for minimizing wasted time and effort. Consider these strategies:

Log Decking: Create a designated area for stacking logs. Stack them in a way that allows for good airflow to promote drying.
Log Lifters: Use log lifters or cant hooks to move and position logs safely and easily.
Skidding: If you’re working in the woods, use a skidder or a winch to move logs to a central location.

Data Point: A well-organized log decking system can reduce log handling time by up to 40%.

Sustainable Timber Sourcing

Choosing sustainable timber isn’t just good for the environment; it can also be good for your bottom line. Here’s how:

Source Locally: Buying timber from local suppliers reduces transportation costs and supports local economies.
Choose Certified Wood: Look for wood that’s certified by organizations like the Forest Stewardship Council (FSC). This ensures that the wood comes from responsibly managed forests.
Salvage Wood: Consider using salvaged wood from fallen trees or demolition sites. This can be a cost-effective and environmentally friendly option.

Personal Experience: I recently started sourcing timber from a local sawmill that uses sustainable harvesting practices. Not only am I supporting a local business, but I’m also getting high-quality wood at a competitive price.

Tool Usage Efficiency

Using your tools efficiently is essential for maximizing productivity and minimizing wear and tear. Here are a few tips:

Chainsaw Maintenance: Keep your chainsaw clean, well-lubricated, and properly sharpened.
Splitting Tools: Use a log splitter to split firewood quickly and easily. Choose a splitter that’s appropriate for the size of the logs you’re working with.
Personal Protective Equipment (PPE): Always wear appropriate PPE, including a helmet, eye protection, hearing protection, and gloves.

Data Point: Using a hydraulic log splitter can split firewood up to 10 times faster than using a manual axe.

Challenges and Solutions in Wood Processing

No matter how well you plan, you’re bound to encounter challenges along the way. Here are a few common challenges and some potential solutions:

Minimizing Wood Waste

Wood waste is a common problem in wood processing. Here are a few ways to minimize it:

Plan Carefully: Plan your cuts carefully to minimize the amount of waste.
Use Offcuts: Use offcuts for smaller projects or for kindling.
Compost or Mulch: Compost or mulch any remaining wood waste.

Managing Moisture Levels

Properly drying wood is essential for preventing rot and ensuring that it burns efficiently. Here are a few tips:

Stack Logs Properly: Stack logs in a way that allows for good airflow.
Use a Moisture Meter: Use a moisture meter to check the moisture content of the wood.
Kiln Drying: Consider kiln drying wood for faster and more consistent drying.

Data Point: Firewood should have a moisture content of 20% or less for optimal burning.

Dealing with Knotty Wood

Knotty wood can be difficult to split and process. Here are a few tips:

Use a Hydraulic Log Splitter: A hydraulic log splitter can make splitting knotty wood much easier.
Split Along the Grain: Split the wood along the grain whenever possible.
Use a Wedge: Use a wedge to split particularly stubborn knots.

Current Trends and Best Practices

The world of wood processing is constantly evolving. Here are a few current trends and best practices to keep in mind:

Automation

Automation is becoming increasingly common in wood processing. Automated log handling systems and robotic sawmills can significantly increase efficiency and productivity.

Digitalization

Digitalization is also playing a growing role in wood processing. Software can be used to optimize log bucking, track inventory, and manage production.

Sustainability

Sustainability is becoming increasingly important in the wood processing industry. Consumers are demanding wood products that are sourced from responsibly managed forests.

Step-by-Step Instructions: Preparing Logs for Splitting

Here’s a step-by-step guide to preparing logs for splitting:

Assess the Log: Examine the log for knots, cracks, and other defects.
Choose a Splitting Method: Decide whether you’ll be splitting the log by hand or with a log splitter.
Position the Log: Place the log on a stable surface.
Split the Log: Split the log along the grain, using a splitting axe or a log splitter.
Stack the Split Wood: Stack the split wood in a way that allows for good airflow.

Tailoring Strategies for Different Operations

The strategies I’ve outlined can be adapted to suit different types of wood processing operations, from small workshops to independent loggers and large-scale firewood producers. Here’s how:

Small Workshops

Small workshops can focus on optimizing their workflow and using efficient tools. They can also specialize in niche products or services to differentiate themselves from larger competitors.

Independent Loggers

Independent loggers can focus on sustainable harvesting practices and building relationships with local sawmills and timber buyers. They can also invest in equipment that increases their efficiency and reduces their risk of injury.

Firewood Producers

Firewood producers can focus on optimizing their drying process and marketing their product effectively. They can also offer value-added services, such as delivery and stacking.

Final Thoughts: Your Path to Wood Processing Success

Choosing the right chain for your Stihl MS391 is just the beginning. By understanding the specifications, maintaining your chain properly, and optimizing your entire wood processing workflow, you can significantly improve your efficiency, productivity, and safety. Remember to stay informed about current trends and best practices, and always prioritize sustainability. Whether you’re a hobbyist, an independent logger, or a firewood producer, with the right knowledge and tools, you can achieve wood processing success.

Key Takeaways:

Know your Stihl MS391 chain specifications (pitch, gauge, drive links).
Choose the right chain type for your cutting needs (full chisel, semi-chisel, low-profile).
Maintain your chain regularly (sharpening, depth gauge adjustment, lubrication).
Optimize your wood processing workflow (log handling, timber sourcing, tool usage).
Address common challenges (wood waste, moisture levels, knotty wood).

Next Steps:

Check your Stihl MS391 manual for recommended chain sizes.
Inspect your current chain for wear and tear.
Invest in a good quality chainsaw file and depth gauge tool.
Start planning your next wood processing project with sustainability in mind.

Now, get out there and make some sawdust! And remember, always prioritize safety and have fun.

Stihl MS391 Chain Size Guide (5 Pro Tips for Perfect Fit)