028 AV Super Wood Boss Review (5 Fixes for Smooth Sawing)
I’ll never forget the day I first laid hands on a Stihl 028 AV Super Wood Boss. It was a hand-me-down from my grandfather, a grizzled old logger who swore by its reliability. He’d used it to fell countless trees in the Pacific Northwest, and while it showed its age, that saw still had some serious bite. But like any well-used tool, it had its quirks. It wasn’t always the smoothest operator, and sometimes it would bog down in the middle of a cut, leaving me frustrated and sweating. That’s when I began my journey of understanding and troubleshooting this iconic chainsaw. This article isn’t just a review; it’s a deep dive into understanding how to keep your Stihl 028 AV Super Wood Boss running like a top, based on my years of experience.
Stihl 028 AV Super Wood Boss: 5 Fixes for Smooth Sawing
The Stihl 028 AV Super Wood Boss is a legend for a reason. It’s a durable, powerful saw that can handle a wide range of tasks, from felling small trees to bucking firewood. But even the best chainsaws can develop problems over time. The user intent behind searching for a “Stihl 028 AV Super Wood Boss Review (5 Fixes for Smooth Sawing)” is clear: they want to troubleshoot performance issues and keep their saw running smoothly. They’re likely experiencing problems like:
- Bogging down during cuts: The engine loses power and stalls.
- Rough or uneven cuts: The chain isn’t cutting cleanly.
- Difficult starting: The saw is hard to start, especially when warm.
- Excessive vibration: Making the saw uncomfortable to use.
- Oil leaks: Leading to inefficient lubrication and potential engine damage.
In this article, I’ll share five common fixes that can address these problems and restore your 028 AV Super Wood Boss to its former glory. We’ll cover everything from carburetor adjustments to chain sharpening, all explained in a clear, step-by-step manner.
Understanding Your Stihl 028 AV Super Wood Boss
Before we dive into the fixes, let’s briefly discuss the key components of the 028 AV Super Wood Boss. This will give you a better understanding of how the saw works and why these fixes are necessary.
- Engine: A two-stroke engine that requires a mix of gasoline and oil.
- Carburetor: Regulates the fuel-air mixture entering the engine.
- Ignition System: Includes the spark plug and ignition module, responsible for igniting the fuel-air mixture.
- Fuel System: Consists of the fuel tank, fuel filter, and fuel lines, delivering fuel to the carburetor.
- Oil System: Lubricates the chain and bar, reducing friction and wear.
- Chain and Bar: The cutting components of the saw.
- Air Filter: Prevents dirt and debris from entering the engine.
Key Terms and Concepts:
- Two-Stroke Engine: An engine that completes a power cycle with two strokes of the piston. Requires a fuel-oil mixture for lubrication.
- Carburetor Adjustment: Fine-tuning the fuel-air mixture for optimal engine performance.
- Chain Pitch: The distance between three consecutive rivets on the chain, divided by two.
- Chain Gauge: The thickness of the drive links on the chain.
- Green Wood: Freshly cut wood with a high moisture content.
- Seasoned Wood: Wood that has been dried to a lower moisture content, making it easier to burn and less prone to rot. Typically, seasoned firewood has a moisture content of 20% or less.
- Bar Oil: A specialized oil designed to lubricate the chain and bar of a chainsaw.
Fix #1: Carburetor Adjustment for Optimal Performance
A poorly adjusted carburetor is a common cause of bogging down and rough running. The carburetor controls the fuel-air mixture, and if it’s not properly adjusted, the engine won’t receive the right amount of fuel.
The Problem:
- Engine bogs down during acceleration.
- Idles poorly or stalls.
- Emits excessive smoke.
The Solution:
The Stihl 028 AV Super Wood Boss carburetor typically has three adjustment screws:
- L (Low-Speed): Controls the fuel mixture at idle and low speeds.
- H (High-Speed): Controls the fuel mixture at high speeds.
- LA (Idle Speed): Adjusts the engine’s idling speed.
Step-by-Step Guide:
- Safety First: Wear safety glasses and gloves. Ensure the chainsaw is on a stable surface and the chain brake is engaged.
- Locate the Carburetor Adjustment Screws: These screws are usually located on the side of the carburetor, often marked with “L,” “H,” and “LA.” Refer to your owner’s manual for the exact location.
- Warm Up the Engine: Start the chainsaw and let it run for a few minutes to warm up.
- Adjust the Low-Speed Screw (L):
- Turn the “L” screw clockwise until the engine starts to stumble or stall.
- Then, slowly turn the “L” screw counterclockwise until the engine runs smoothly and accelerates cleanly without hesitation.
- Adjust the High-Speed Screw (H):
- Caution: This step requires careful attention. Running the engine too lean (too little fuel) at high speeds can cause serious damage.
- With the chain brake engaged, gently rev the engine to full throttle for a few seconds.
- Listen carefully to the engine. If it sounds like it’s “screaming” or running very lean, immediately turn the “H” screw counterclockwise to richen the mixture.
- The goal is to find the point where the engine runs smoothly at full throttle without sounding strained or emitting excessive smoke.
- Adjust the Idle Speed Screw (LA):
- Turn the “LA” screw until the chain stops moving when the engine is idling. The engine should idle smoothly without stalling.
- Fine-Tune: After making these adjustments, let the engine cool down and restart it. Recheck the idle and acceleration. You may need to make minor adjustments to the “L” and “LA” screws.
- Test Cut: Make a few test cuts to ensure the chainsaw is running smoothly under load.
- Verify Chain Stop: Double check that the chain stops spinning when the engine is at idle. If the chain still moves, reduce the idle speed until the chain stops. An easy way to check it is to place the saw on the ground and gently engage the throttle. If the chain spins on the ground, it’s too high.
Example:
I once had a customer who brought in his 028 AV Super Wood Boss complaining that it wouldn’t idle and kept stalling. After checking the fuel and air filters, I discovered that the “L” screw was turned in too far, causing a lean mixture at idle. I adjusted the “L” screw according to the steps above, and the chainsaw idled perfectly.
Strategic Advantage:
Proper carburetor adjustment not only improves engine performance but also extends the life of the engine by ensuring optimal combustion and reducing wear.
Technical Details:
- Tool: Screwdriver (usually a small flathead)
- Skill Level: Beginner to Intermediate
- Estimated Time: 15-30 minutes
Fix #2: Sharpening or Replacing the Chain for Clean Cuts
A dull or damaged chain is another common cause of rough cuts and bogging down. A sharp chain bites into the wood efficiently, while a dull chain tears and shreds the wood, requiring more effort and potentially damaging the saw.
The Problem:
- Chain cuts slowly or not at all.
- Produces sawdust instead of chips.
- Chain pulls to one side.
- Excessive vibration.
The Solution:
Sharpen the chain regularly or replace it when it becomes excessively worn or damaged.
Step-by-Step Guide (Sharpening):
- Safety First: Wear safety glasses and gloves. Secure the chainsaw in a vise or clamp.
- Identify the Correct File Size: The correct file size depends on the chain pitch. Refer to your owner’s manual or the chain manufacturer’s recommendations. A common size for the 028 AV Super Wood Boss is a 5/32″ (4.0 mm) round file.
- Set the Correct Filing Angle: The filing angle is typically marked on the chain’s cutting teeth. Use a chainsaw file guide to maintain the correct angle. This is critical because if you don’t use a file guide, you can cause more damage to the chain.
- File Each Cutting Tooth:
- Hold the file at the correct angle and file each cutting tooth from the inside out, using smooth, even strokes.
- File each tooth the same number of times to maintain consistent sharpness.
- Pay attention to the depth gauges (rakers) and file them down as needed, using a flat file and a depth gauge tool. The depth gauge controls how deeply the cutting tooth bites into the wood.
- Check the Chain for Damage: Inspect the chain for cracks, broken teeth, or other damage. Replace the chain if necessary.
- Lubricate the Chain: Apply bar oil to the chain before using the chainsaw.
Step-by-Step Guide (Replacing):
- Safety First: Wear safety glasses and gloves. Ensure the chainsaw is turned off and the chain brake is engaged.
- Loosen the Bar Nuts: Loosen the bar nuts that hold the bar cover in place.
- Remove the Bar Cover: Remove the bar cover and the old chain.
- Install the New Chain:
- Place the new chain around the bar, ensuring the cutting teeth are facing in the correct direction (they should point in the direction of chain rotation).
- Position the chain on the drive sprocket and bar.
- Adjust the Chain Tension:
- Use the chain tensioning screw to adjust the chain tension. The chain should be snug on the bar but still able to be pulled around by hand.
- Tighten the bar nuts securely.
- Check Chain Tension Again: Start the chainsaw and run it briefly. Recheck the chain tension and adjust as needed.
Case Study:
I was once working on a large oak tree that had fallen in a storm. I was using my 028 AV Super Wood Boss, but the chain was dull, and I was struggling to make clean cuts. I took the time to sharpen the chain using a file guide, and the difference was remarkable. The saw cut through the oak like butter, and I was able to finish the job much faster and with less effort.
Strategic Advantage:
A sharp chain not only improves cutting performance but also reduces strain on the engine and extends the life of the saw. It also reduces the risk of kickback, a dangerous situation where the saw suddenly jumps back towards the operator.
Technical Details:
- Tools: Chainsaw file, file guide, flat file, depth gauge tool, vise or clamp, wrench.
- Materials: New chainsaw chain, bar oil.
- Skill Level: Beginner to Intermediate
- Estimated Time: 15-45 minutes
Fix #3: Cleaning or Replacing the Air Filter for Proper Airflow
A clogged air filter restricts airflow to the engine, causing it to run poorly and lose power. The air filter prevents dirt and debris from entering the engine, and it’s essential to keep it clean for optimal performance.
The Problem:
- Engine loses power.
- Difficult starting.
- Emits excessive smoke.
The Solution:
Clean or replace the air filter regularly, depending on the conditions in which you use the chainsaw.
Step-by-Step Guide (Cleaning):
- Safety First: Ensure the chainsaw is turned off.
- Locate the Air Filter: The air filter is usually located under a cover on the top or side of the engine. Refer to your owner’s manual for the exact location.
- Remove the Air Filter Cover: Remove the air filter cover.
- Remove the Air Filter: Carefully remove the air filter.
- Clean the Air Filter:
- Foam Filter: Wash the foam filter with warm, soapy water. Rinse thoroughly and allow it to dry completely. You can also use compressed air to blow out any remaining dirt.
- Paper Filter: Gently tap the paper filter to remove loose dirt and debris. You can also use compressed air to blow out the dirt from the inside out.
- Inspect the Air Filter: Check the air filter for damage, such as tears or holes. Replace the air filter if it’s damaged.
- Reinstall the Air Filter: Reinstall the air filter and the air filter cover.
Step-by-Step Guide (Replacing):
- Safety First: Ensure the chainsaw is turned off.
- Locate the Air Filter: The air filter is usually located under a cover on the top or side of the engine. Refer to your owner’s manual for the exact location.
- Remove the Air Filter Cover: Remove the air filter cover.
- Remove the Old Air Filter: Carefully remove the old air filter.
- Install the New Air Filter: Install the new air filter, making sure it’s properly seated.
- Reinstall the Air Filter Cover: Reinstall the air filter cover.
Personal Experience:
I once neglected to clean the air filter on my 028 AV Super Wood Boss for several weeks while working on a dusty logging site. The saw started to lose power and became difficult to start. After cleaning the air filter, the saw ran like new again.
Strategic Advantage:
A clean air filter ensures proper airflow to the engine, improving performance, fuel efficiency, and extending the life of the engine.
Technical Details:
- Tools: Screwdriver (if needed), compressed air (optional).
- Materials: Warm, soapy water, new air filter (if replacing).
- Skill Level: Beginner
- Estimated Time: 5-15 minutes
Fix #4: Inspecting and Cleaning the Spark Plug for Reliable Ignition
A faulty spark plug can cause difficult starting, misfires, and poor engine performance. The spark plug ignites the fuel-air mixture in the engine, and it’s essential to keep it clean and in good condition.
The Problem:
- Difficult starting.
- Engine misfires or runs unevenly.
- Loss of power.
The Solution:
Inspect, clean, or replace the spark plug as needed.
Step-by-Step Guide:
- Safety First: Ensure the chainsaw is turned off.
- Locate the Spark Plug: The spark plug is usually located on the side of the engine, under a spark plug boot.
- Remove the Spark Plug Boot: Pull the spark plug boot off the spark plug.
- Remove the Spark Plug: Use a spark plug wrench to remove the spark plug.
- Inspect the Spark Plug:
- Electrode: Check the electrode for wear, damage, or carbon buildup.
- Insulator: Check the insulator for cracks or damage.
- Color: The color of the spark plug can indicate engine problems. A light tan color is ideal. A black, sooty spark plug indicates a rich fuel mixture, while a white spark plug indicates a lean fuel mixture.
- Clean the Spark Plug (Optional): If the spark plug is only slightly dirty, you can clean it with a wire brush or spark plug cleaner.
- Gap the Spark Plug: Use a spark plug gapping tool to ensure the spark plug gap is correct. Refer to your owner’s manual for the correct gap specification. A common gap for small engines is 0.025″ (0.64 mm).
- Install the Spark Plug: Install the spark plug and tighten it with a spark plug wrench.
- Reinstall the Spark Plug Boot: Reinstall the spark plug boot.
Case Study:
I had a friend who was having trouble starting his 028 AV Super Wood Boss. He had checked the fuel and air filter, but the saw still wouldn’t start. I suggested he check the spark plug. He removed the spark plug and found that it was heavily fouled with carbon buildup. He cleaned the spark plug and gapped it correctly, and the saw started on the first pull.
Strategic Advantage:
A clean and properly gapped spark plug ensures reliable ignition, improving engine performance and fuel efficiency.
Technical Details:
- Tools: Spark plug wrench, spark plug gapping tool, wire brush or spark plug cleaner.
- Materials: New spark plug (if replacing).
- Skill Level: Beginner
- Estimated Time: 10-20 minutes
Fix #5: Checking and Cleaning the Fuel Filter for Proper Fuel Delivery
A clogged fuel filter restricts fuel flow to the carburetor, causing the engine to run poorly or not start at all. The fuel filter prevents dirt and debris from entering the carburetor, and it’s essential to keep it clean for proper fuel delivery.
The Problem:
- Difficult starting.
- Engine loses power.
- Engine stalls.
The Solution:
Check and clean or replace the fuel filter regularly.
Step-by-Step Guide:
- Safety First: Ensure the chainsaw is turned off and the fuel tank is empty or nearly empty. Work in a well-ventilated area.
- Locate the Fuel Filter: The fuel filter is usually located inside the fuel tank, attached to the end of the fuel line.
- Remove the Fuel Cap: Remove the fuel cap.
- Locate the Fuel Line: Use a bent wire or a small hook to reach into the fuel tank and pull out the fuel line. Be careful not to damage the fuel line.
- Remove the Fuel Filter: Disconnect the fuel filter from the fuel line.
- Inspect the Fuel Filter: Check the fuel filter for dirt and debris.
- Clean the Fuel Filter (Optional): If the fuel filter is only slightly dirty, you can clean it by blowing it out with compressed air or washing it with clean gasoline.
- Replace the Fuel Filter (Recommended): It’s generally recommended to replace the fuel filter rather than cleaning it, as it’s difficult to remove all the dirt and debris.
- Install the New Fuel Filter: Connect the new fuel filter to the fuel line.
- Reinstall the Fuel Line: Carefully reinsert the fuel line into the fuel tank.
- Reinstall the Fuel Cap: Reinstall the fuel cap.
Personal Experience:
I once had a 028 AV Super Wood Boss that would start and run for a few minutes, then stall. I checked everything else, but couldn’t figure out the problem. Finally, I decided to check the fuel filter. When I pulled it out, it was completely clogged with dirt and debris. I replaced the fuel filter, and the saw ran perfectly.
Strategic Advantage:
A clean fuel filter ensures proper fuel delivery to the carburetor, improving engine performance and preventing damage to the carburetor.
Technical Details:
- Tools: Bent wire or small hook.
- Materials: New fuel filter, clean gasoline (optional), compressed air (optional).
- Skill Level: Beginner
- Estimated Time: 10-20 minutes
Additional Tips for Maintaining Your Stihl 028 AV Super Wood Boss
- Use Fresh Fuel: Use fresh, high-quality gasoline and mix it with the correct amount of two-stroke oil. Stale fuel can cause problems with the carburetor and engine. The recommended fuel-oil mixture for the 028 AV Super Wood Boss is typically 50:1 (50 parts gasoline to 1 part oil).
- Store Your Chainsaw Properly: When storing your chainsaw for an extended period, drain the fuel tank and run the engine until it stalls to remove any remaining fuel from the carburetor. This will prevent the fuel from gumming up the carburetor.
- Regularly Inspect the Bar and Chain: Check the bar for wear and damage. Clean the bar groove regularly to ensure proper lubrication.
- Keep the Chain Oiler Functioning: Make sure the chain oiler is working properly to keep the chain and bar lubricated.
- Consult Your Owner’s Manual: Your owner’s manual is a valuable resource for information about your chainsaw. Refer to it for specific maintenance instructions and troubleshooting tips.
Safety Considerations
- Always Wear Safety Gear: Wear safety glasses, hearing protection, gloves, and sturdy boots when operating a chainsaw.
- Be Aware of Your Surroundings: Be aware of your surroundings and avoid cutting in areas where there are people, animals, or obstacles.
- Use Proper Cutting Techniques: Use proper cutting techniques to avoid kickback and other hazards.
- Never Operate a Chainsaw When Tired or Under the Influence: Operating a chainsaw requires concentration and coordination. Never operate a chainsaw when you are tired, under the influence of alcohol or drugs, or taking medication that may impair your judgment.
Conclusion
The Stihl 028 AV Super Wood Boss is a reliable and powerful chainsaw that can provide years of service with proper maintenance. By following these five fixes and the additional tips I’ve shared, you can keep your 028 AV Super Wood Boss running smoothly and efficiently. Remember to always prioritize safety and consult your owner’s manual for specific instructions and recommendations.
Now that you’ve armed yourself with this knowledge, it’s time to put it into practice. Grab your tools, inspect your chainsaw, and start troubleshooting. With a little effort, you can restore your 028 AV Super Wood Boss to its former glory and enjoy years of smooth sawing. Good luck, and happy cutting!
