Stihl 660 for Sale: Expert Tips on Using 48″ Bars (7 Pro Hacks)

Introduction: The Allure of the Stihl 660 and the 48″ Bar

The world of professional logging and serious firewood production is seeing a fascinating trend: a resurgence of interest in robust, reliable chainsaws like the Stihl MS 660. While newer models boast advanced features, the 660 remains a workhorse, particularly when paired with a longer bar. I’ve noticed this trend firsthand, both online and in my own woodlot. People are seeking that perfect blend of raw power and proven durability, and the 660 often fits the bill. The interest in longer bars, specifically the 48″ variety, speaks to a desire to tackle larger diameter trees efficiently. However, wielding this combination demands respect, skill, and a thorough understanding of the equipment and the wood you’re cutting.

This guide is designed to equip you with the knowledge and insights necessary to safely and effectively use a Stihl MS 660 with a 48″ bar. I’ll share my experiences, technical details, and pro hacks gleaned from years of working with chainsaws and processing timber. Let’s dive in.

Mastering the Stihl MS 660 with a 48″ Bar: 7 Pro Hacks

Understanding the Stihl MS 660: A Technical Overview

Before we delve into the hacks, let’s establish a solid understanding of the Stihl MS 660 itself. This isn’t just about horsepower; it’s about the machine’s inherent capabilities and limitations.

• Engine Displacement: The MS 660 boasts a powerful 91.6 cc (5.6 cu in) two-stroke engine. This is crucial because a 48″ bar demands significant power to pull the chain through hardwoods.
• Power Output: Expect around 7.1 bhp (5.3 kW). This figure is important for calculating cutting speeds and anticipating the saw’s performance in different wood densities.
• Weight: The powerhead itself weighs approximately 7.3 kg (16.1 lbs). Add the 48″ bar and chain, and you’re looking at a considerable weight. This impacts fatigue and maneuverability.
• Fuel Capacity: A 0.825 L (27.9 oz) fuel tank is standard. Keep this in mind for longer cutting sessions; carrying extra fuel is essential.
• Oil Capacity: The oil tank holds 0.360 L (12.2 oz). Chain lubrication is paramount, especially with a longer bar. Insufficient lubrication leads to premature wear and potential kickback.
• Chain Oil Type: Stihl recommends their own chain oil, but any high-quality bar and chain oil designed for heavy-duty use will suffice. I personally prefer using a biodegradable chain oil to minimize environmental impact when working in sensitive areas.
• Recommended Bar Lengths: While the 660 can handle a 48″ bar, Stihl officially recommends a range of 20″ to 36″. Pushing beyond this requires careful consideration of the wood type and cutting technique.
• Chain Pitch: Typically, a .404″ chain pitch is used with longer bars on the 660 for aggressive cutting.
• Chain Gauge: A .063″ (1.6 mm) chain gauge provides a robust cutting profile.

My Experience: I once tried using a 42″ bar with a .375″ pitch chain on a particularly dense oak log. The saw bogged down significantly, and the chain overheated quickly. Switching to a .404″ pitch chain made a world of difference. This highlights the importance of matching the chain to the bar and the wood type.

Hack #1: The Perfect Chain Selection and Sharpening

The chain is your primary cutting tool. A dull or incorrectly chosen chain will negate the power of the MS 660 and increase the risk of kickback.

• Chain Type: For a 48″ bar, I recommend a full chisel chain for felling and bucking larger trees. It offers aggressive cutting but requires more frequent sharpening. Semi-chisel chains are more forgiving and stay sharper longer, but they cut slower.
• Sharpening Angle: Maintain a consistent sharpening angle. Stihl recommends 30 degrees for the top plate angle and 60 degrees for the side plate angle for most chains. Deviating from these angles reduces cutting efficiency.
• Depth Gauge Setting: The depth gauge (raker) setting is critical. A setting that’s too low results in aggressive cutting and increased kickback risk. A setting that’s too high reduces cutting efficiency. A good starting point is 0.025″ (0.635 mm) below the top of the cutter for hardwoods and slightly higher for softwoods.
• Sharpening Frequency: Sharpen the chain frequently. I sharpen my chain after every tank of fuel, or more often if I encounter dirt or debris. A sharp chain reduces strain on the saw and the operator.
• Chain Tension: Proper chain tension is crucial. The chain should be snug against the bar but still able to be pulled around by hand. Too tight, and it will overheat and stretch. Too loose, and it will derail.
• Chain Grinder vs. Hand Filing: While hand filing is a valuable skill, a chain grinder provides more consistent and accurate sharpening, especially for maintaining the correct angles on a long chain. I use a grinder for initial sharpening and touch-ups, and hand filing for maintenance in the field.

Data Point: A study by Oregon State University found that a properly sharpened chain can increase cutting efficiency by up to 30% compared to a dull chain.

Hack #2: Mastering the Felling Cut with a Long Bar

Felling a tree with a 48″ bar requires precision and a deep understanding of directional felling techniques. This isn’t for beginners.

• The Hinge: The hinge is the most crucial element of a felling cut. It controls the direction of the fall. With a 48″ bar, you have the reach to create a wider hinge, providing more control. Aim for a hinge width that is approximately 80% of the tree’s diameter.
• The Notch: The notch determines the direction of fall. A precise notch is essential. Use a 45-degree open-face notch for most situations. The depth of the notch should be approximately 20% of the tree’s diameter.
• The Back Cut: The back cut should be level and slightly above the apex of the notch. Leave sufficient wood to create the hinge. Avoid cutting all the way through the tree, as this eliminates control.
• Felling Wedges: Use felling wedges to prevent the tree from pinching the bar and to help direct the fall. Plastic wedges are safer than steel wedges, as they won’t damage the chain if accidentally contacted.
• Push Poles: A push pole can provide extra leverage to help direct the fall, especially for larger trees.
• Tree Lean: Always assess the natural lean of the tree. Use this information to your advantage when planning the felling cut.
• Escape Route: Plan a clear escape route at a 45-degree angle away from the direction of the fall. Always be aware of your surroundings and potential hazards.

Safety Code: OSHA regulations require a minimum distance of two tree lengths between workers during felling operations.

Case Study: I once felled a large oak tree with a significant lean in the wrong direction. I used multiple felling wedges and a powerful push pole to overcome the lean and direct the fall safely. Without these tools and techniques, the tree could have fallen unpredictably.

Hack #3: Bucking Techniques for Large Diameter Logs

Bucking refers to cutting a felled tree into smaller, manageable lengths. A 48″ bar is invaluable for bucking large diameter logs, but it also presents unique challenges.

• Log Support: Proper log support is essential for safe and efficient bucking. Use log jacks or other supports to elevate the log and prevent the bar from pinching.
• Cutting Strategy: Plan your cuts carefully. Avoid cutting through knots or other obstructions, as these can cause the bar to pinch.
• Overbucking and Underbucking: Use a combination of overbucking (cutting from the top down) and underbucking (cutting from the bottom up) to prevent the log from splitting or pinching the bar.
• Bore Cutting: Bore cutting involves plunging the tip of the bar into the log to create a cut from the inside out. This technique is useful for relieving tension and preventing splitting. However, it’s also a high-risk technique that requires careful control to avoid kickback.
• Log Rolling: Use cant hooks or peaveys to roll logs into a more favorable position for bucking.
• Chain Brakes: Always engage the chain brake when moving the saw between cuts.
• Body Positioning: Maintain a stable stance and keep both hands on the saw at all times. Avoid reaching or overextending yourself.

Measurement: A standard cord of firewood measures 4 feet high, 4 feet wide, and 8 feet long, totaling 128 cubic feet. Knowing this helps estimate the volume of wood you’re processing.

Material Specification: Firewood should ideally have a moisture content of 20% or less for efficient burning. Use a moisture meter to check the moisture content of your firewood before burning it.

Hack #4: Maintaining Optimal Chain Oil Flow

A 48″ bar demands a high volume of chain oil to prevent overheating and premature wear. Ensuring adequate oil flow is crucial.

• Oil Pump Adjustment: Most Stihl chainsaws have an adjustable oil pump. Increase the oil flow setting when using a longer bar, especially when cutting hardwoods.
• Oil Viscosity: Use a higher viscosity chain oil in warmer weather and a lower viscosity oil in colder weather. This helps maintain consistent oil flow.
• Oil Filter: Regularly check and clean the oil filter to prevent clogging. A clogged filter restricts oil flow and can damage the bar and chain.
• Bar Oiler Hole: Ensure the bar oiler hole is clear of debris. Use a small wire or pick to clear any obstructions.
• Bar Groove Cleaning: Clean the bar groove regularly to remove sawdust and debris. This ensures proper oil distribution along the bar.
• Bar Rail Lubrication: Apply grease to the bar rails periodically to reduce friction and wear.
• Visual Inspection: Regularly inspect the bar and chain for signs of overheating or inadequate lubrication. Look for discoloration, excessive wear, or a dry chain.

Technical Limitation: Over-oiling is preferable to under-oiling. Excessive oil will simply be flung off the chain, while insufficient oil can lead to catastrophic damage.

Hack #5: Managing Saw Vibration and Fatigue

Using a heavy saw with a long bar can be physically demanding. Managing vibration and fatigue is essential for preventing injuries.

• Anti-Vibration System: The Stihl MS 660 features an anti-vibration system that reduces the amount of vibration transmitted to the operator. Ensure this system is in good working order.
• Proper Grip: Maintain a firm but relaxed grip on the saw. Avoid gripping too tightly, as this can increase fatigue.
• Work Breaks: Take frequent work breaks to rest and stretch. Fatigue increases the risk of accidents.
• Ergonomic Techniques: Use proper body mechanics when lifting and operating the saw. Avoid bending over excessively or twisting your body.
• Protective Gear: Wear appropriate protective gear, including gloves, hearing protection, and eye protection.
• Saw Balance: Ensure the saw is properly balanced. A poorly balanced saw will require more effort to control and can increase fatigue.
• Physical Conditioning: Maintain a good level of physical fitness. Regular exercise can help improve your strength and endurance.

Data Point: Studies have shown that prolonged exposure to chainsaw vibration can lead to hand-arm vibration syndrome (HAVS), a debilitating condition that affects the nerves and blood vessels in the hands and arms.

Hack #6: Optimizing Fuel Mixture and Air Filter Maintenance

The Stihl MS 660 requires a precise fuel mixture for optimal performance. Proper air filter maintenance is equally important.

• Fuel Mixture: Use a fuel mixture of 50:1 (gasoline to two-stroke oil). Use high-quality two-stroke oil designed for air-cooled engines.
• Fuel Stabilizer: Add fuel stabilizer to the fuel mixture to prevent degradation, especially if the saw will be stored for an extended period.
• Air Filter Cleaning: Clean the air filter regularly, especially when working in dusty conditions. A dirty air filter restricts airflow and reduces engine performance.
• Air Filter Type: Use the correct type of air filter for your saw. Stihl offers different types of air filters for different operating conditions.
• Spark Plug: Check the spark plug regularly and replace it if necessary. A fouled spark plug can cause the engine to misfire.
• Carburetor Adjustment: The carburetor may need to be adjusted periodically to maintain optimal engine performance. Consult the owner’s manual or a qualified technician for instructions.

Tool Requirement: A tachometer is essential for accurately adjusting the carburetor.

Hack #7: Safe Transportation and Storage

Proper transportation and storage are essential for protecting your Stihl MS 660 and preventing accidents.

• Bar Scabbard: Always use a bar scabbard to cover the bar and chain during transportation and storage. This prevents accidental contact with the sharp chain.
• Fuel Tank: Empty the fuel tank before storing the saw for an extended period. This prevents fuel degradation and potential leaks.
• Storage Location: Store the saw in a dry, secure location away from children and unauthorized users.
• Transportation: Secure the saw properly during transportation to prevent it from shifting or falling.
• Chain Tension: Loosen the chain tension before storing the saw to prevent the chain from stretching or binding.
• Cleaning: Clean the saw thoroughly before storing it to remove sawdust and debris.
• Owner’s Manual: Keep the owner’s manual in a safe place for future reference.

Industry Standard: Most forestry regulations require that chainsaws be transported with the chain brake engaged and the bar covered.

Personalized Storytelling: I once transported my chainsaw in the back of my truck without securing it properly. The saw slid around during transit, and the bar scabbard came off. Fortunately, no one was injured, but it was a close call. This experience taught me the importance of proper transportation procedures.

Conclusion: Respect the Power, Master the Skill

Using a Stihl MS 660 with a 48″ bar is a powerful combination, but it demands respect and skill. By understanding the technical aspects of the saw, mastering the cutting techniques, and prioritizing safety, you can harness its potential and achieve impressive results. Remember to always follow safety guidelines, wear appropriate protective gear, and never operate the saw beyond your capabilities. With practice and dedication, you can become a proficient and safe chainsaw operator. The key is continuous learning and a willingness to adapt to the challenges presented by different wood types and cutting conditions. Good luck, and stay safe out there in the woods!

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