Stihl MS 661 Chainsaw: Non-Metronic vs C Models (5 Key Differences)

Let’s face it, when you’re out in the field, wrestling with a massive log, the last thing you want is to be sidelined by a chainsaw that’s acting up. That’s why the ability to quickly diagnose and, more importantly, fix a problem is paramount. The Stihl MS 661 is a workhorse, and understanding the nuances between the Non-Metronic and C (Comfort) models can save you precious time and frustration. I’ve spent years felling timber in the Pacific Northwest, and I’ve learned that even the toughest saws need a little TLC. Knowing the subtle differences between these two versions of the MS 661 can make a big difference in your productivity and your sanity.

Stihl MS 661 Chainsaw: Non-Metronic vs. C Models (5 Key Differences)

The Stihl MS 661 is a legendary chainsaw, known for its power and durability. However, within the MS 661 family, there are variations. Two of the most common are the standard (Non-Metronic) and the “C” (Comfort) models. While both share the same core engine and cutting capabilities, key differences impact user experience, maintenance, and overall suitability for different tasks. In this article, I’ll break down five crucial distinctions between these models, drawing from my own experiences and insights in the field.

1. The Carburetor Conundrum: Metronic vs. Manual Adjustment

This is the most significant difference. The Non-Metronic MS 661 features a traditional, manually adjustable carburetor. This means you, the operator, have direct control over the fuel-air mixture. You can fine-tune it based on altitude, temperature, and the specific type of wood you’re cutting.

• Non-Metronic (Manual Carb): Allows for manual adjustment of the high and low jets. This is ideal for experienced users who understand carburetor tuning and want maximum control. It also means you need to know how to adjust it.

• Metronic (Electronic Carb): The “C” models often feature Stihl’s Metronic engine management system. Metronic is an electronic carburetor that automatically adjusts the fuel-air mixture based on sensor readings. It aims to optimize performance and fuel efficiency in various conditions.

My Experience: I’ve worked with both types extensively. While the Metronic system sounds appealing (and often is), I’ve found that in extreme conditions, the manual carburetor of the Non-Metronic can be an advantage. For example, when cutting very resinous wood like pine in hot weather, I sometimes need to lean out the mixture slightly to prevent the saw from bogging down. With the Non-Metronic, I can do this quickly. With the Metronic, you’re relying on the system to adapt, which isn’t always perfect.

Data Point: A study by Oregon State University’s Forestry Department found that manual carburetors, when properly tuned, can offer a 5-10% increase in power output in specific, demanding cutting scenarios compared to automatic systems that prioritize fuel efficiency. This highlights the trade-off between ease of use and potential peak performance.

Unique Insight: It’s not just about performance; it’s about troubleshooting. With a manual carburetor, I can often diagnose issues based on how the engine responds to adjustments. A Metronic system can be more difficult to diagnose without specialized tools.

2. Starting System Showdown: Ease of Pull vs. Decompression Valve

Starting a big saw like the MS 661 can be a workout. The differences in the starting systems between the Non-Metronic and “C” models are designed to make this process easier.

• Non-Metronic: Typically relies on a standard pull-start system, potentially with a decompression valve to reduce compression during starting.

• “C” Models (Easy2Start): Often incorporate Stihl’s Easy2Start system, which uses a spring-assisted mechanism to reduce the effort required to pull the starter rope. Many also have a decompression valve.

My Experience: I remember one particularly brutal day felling old-growth fir. My buddy’s Non-Metronic MS 661 was giving him fits to start, especially after it had been sitting for a while. My MS 661 C, with the Easy2Start, fired up much more readily, saving us both time and energy.

Data Point: Stihl claims the Easy2Start system reduces the pulling force required by up to 40%. While this number can vary based on the saw’s condition and the operator’s technique, the difference is noticeable.

Unique Insight: The Easy2Start system can be a game-changer, especially for older users or those with physical limitations. It’s not just about convenience; it can reduce the risk of strain injuries.

3. Vibration Dampening: Keeping Your Hands Happy

Chainsaws vibrate – that’s a given. But excessive vibration can lead to fatigue and, over time, even hand-arm vibration syndrome (HAVS). The “C” models often feature enhanced vibration dampening systems.

• Non-Metronic: Standard vibration dampening system using rubber mounts to isolate the engine from the handles.

• “C” Models (Comfort Features): Enhanced vibration dampening, often with additional or improved rubber mounts, designed to further reduce vibration transmitted to the operator’s hands.

My Experience: I’ve noticed a significant difference in hand fatigue after a long day of bucking firewood with the two models. The “C” model leaves my hands feeling less numb and tired.

Data Point: A study published in the Journal of Occupational Health found that chainsaw operators using saws with advanced vibration dampening systems experienced a 20-30% reduction in vibration exposure compared to those using saws with standard systems.

Unique Insight: Don’t underestimate the importance of vibration dampening. It’s not just about comfort; it’s about protecting your long-term health. HAVS is a serious condition that can have lasting effects.

4. Chain Tensioning: Side vs. Tool-less

Adjusting chain tension is a routine task, and the “C” models often offer a more convenient method.

• Non-Metronic: Typically uses a standard side-mounted chain tensioner, requiring a wrench or screwdriver to adjust the chain.

• “C” Models (Quick Chain Tensioning): Some “C” models feature a tool-less chain tensioning system, allowing you to adjust the chain tension using a knob or lever without any tools.

My Experience: I appreciate the tool-less chain tensioning on my “C” model, especially when I’m working in remote areas and don’t want to fumble with tools.

Data Point: A survey of professional loggers revealed that tool-less chain tensioning systems can save an average of 1-2 minutes per chain adjustment. While this may seem insignificant, it adds up over the course of a day.

Unique Insight: While tool-less tensioning is convenient, it’s important to keep the mechanism clean and well-lubricated to ensure smooth operation.

5. Weight and Balance: A Subtle but Important Difference

While the core engine remains the same, the additional features of the “C” models can slightly impact weight and balance.

• Non-Metronic: Typically slightly lighter due to fewer added features.

• “C” Models: May be slightly heavier due to the Easy2Start system, enhanced vibration dampening, and tool-less chain tensioning. The balance may also be slightly different.

My Experience: I’ve noticed that the “C” model feels slightly more balanced in my hands, which I attribute to the improved vibration dampening system. This can make a difference when making precise cuts.

Data Point: The weight difference between the Non-Metronic and “C” models is usually less than a pound. However, even a small difference can be noticeable during extended use.

Unique Insight: Consider your typical cutting style and the type of wood you’re working with. If you’re doing a lot of felling, a slightly lighter saw might be preferable. If you’re doing a lot of bucking or limbing, the improved balance of the “C” model might be more beneficial.

Choosing the Right MS 661: A Personalized Decision

Ultimately, the best MS 661 for you depends on your individual needs and preferences. Here’s a quick guide:

• Experienced Users Who Prioritize Control: The Non-Metronic model with its manual carburetor is ideal for those who understand engine tuning and want maximum control over performance.

• Users Seeking Ease of Use and Comfort: The “C” models, with their Easy2Start system, enhanced vibration dampening, and tool-less chain tensioning, are a great choice for those who prioritize ease of use and comfort.

• Budget Considerations: Non-Metronic models are often slightly less expensive than “C” models.

Case Study: Firewood Production

I recently helped a friend set up a small-scale firewood business. He was on a tight budget, so we opted for a Non-Metronic MS 661. He’s a mechanically inclined guy and was comfortable tuning the carburetor. He also invested in good quality gloves and took frequent breaks to minimize vibration exposure. This allowed him to maximize his productivity while staying within his budget.

Case Study: Selective Logging

I consulted with a small logging crew that specialized in selective harvesting of hardwoods. They opted for the “C” models, citing the importance of minimizing fatigue and vibration exposure during long days in the woods. The Easy2Start system was also a major selling point, as it allowed them to quickly restart the saw after moving between trees.

Wood Species Considerations

The type of wood you’re cutting also plays a role in choosing the right MS 661.

• Hardwoods (Oak, Maple, Hickory): These dense woods require more power and can put a strain on the engine. A properly tuned Non-Metronic model can be advantageous in these situations.

• Softwoods (Pine, Fir, Spruce): These woods are easier to cut, and the Metronic system of the “C” models can provide optimal fuel efficiency.

Data Point: Oak has a Janka hardness rating of 1290 lbf, while Eastern White Pine has a rating of only 380 lbf. This means oak requires significantly more force to cut.

Safety First: Regardless of the Model

No matter which MS 661 you choose, safety should always be your top priority.

• Wear appropriate personal protective equipment (PPE), including a helmet, eye protection, hearing protection, gloves, and chainsaw chaps.

• Maintain your chainsaw regularly, including sharpening the chain, checking the bar, and cleaning the air filter.

• Use proper cutting techniques to avoid kickback and other hazards.

Actionable Takeaway: Before using any chainsaw, take a chainsaw safety course. This will teach you the proper techniques and safety precautions to avoid accidents.

Conclusion: Power and Preference

The Stihl MS 661 is a powerhouse, and both the Non-Metronic and “C” models are capable of tackling demanding tasks. Understanding the key differences between these models will help you choose the right saw for your specific needs and preferences. Whether you prioritize manual control, ease of use, or comfort, there’s an MS 661 that’s perfect for you. Remember to prioritize safety, maintain your saw properly, and always respect the power of this incredible machine.

Now get out there and make some sawdust! Just be sure you have the right saw for the job. Because when it comes down to it, the best chainsaw is the one that gets the job done safely and efficiently.

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