49SP Jonsered Chainsaw Tips (5 Pro Woodcutting Hacks)

Alright, buckle up, buttercups! I’m about to unleash the secrets of the Jonsered 49SP like a lumberjack on a caffeine bender. We’re not just talking about starting it and making some noise; we’re diving deep into the guts of this beast, optimizing its performance, and making you a woodcutting wizard. I’ve spent years wrestling with logs, dodging widow-makers, and occasionally setting my beard on fire (don’t ask). So, trust me, I know what I’m talking about. Forget those generic chainsaw guides; this is the real deal, seasoned with sawdust and a healthy dose of experience.

49SP Jonsered Chainsaw Tips (5 Pro Woodcutting Hacks)

I’ve used a LOT of chainsaws in my day, from tiny limbing saws to absolute monsters that could fell a redwood. But the Jonsered 49SP… well, it holds a special place in my heart. It’s a classic, a workhorse, and with a little TLC, it can out-perform a lot of modern saws. This guide will give you the knowledge you need to make that happen.

Understanding the Jonsered 49SP: A Brief Overview

Before we dive into the tips and hacks, let’s get familiar with the basics. The Jonsered 49SP is a Swedish-made chainsaw known for its reliability and power. It’s a two-stroke engine saw, meaning it requires a mix of gasoline and oil. This saw is known for its durability and is a favorite among those who want a vintage machine.

Engine: Two-stroke, typically around 49cc.
Bar Length: Usually between 16 and 20 inches, depending on the model and intended use.
Fuel Mix: Typically 50:1 (gas to oil), but always consult your owner’s manual.
Key Features: Inertia chain brake, adjustable oiler, and a relatively simple design for easy maintenance.

Takeaway: Knowing your saw is the first step to mastering it. Understand its limitations and strengths, and you’ll be well on your way to becoming a woodcutting pro.

Tip 1: Mastering the Fuel Mix – The Lifeblood of Your 49SP

Fuel is the single most important aspect of any 2-stroke engine. I’ve seen more saws die from incorrect fuel mixes than from actual wear and tear. Get this wrong, and you’re asking for trouble.

The Right Ratio: The Jonsered 49SP, like most two-stroke saws, requires a precise fuel-to-oil ratio. While 50:1 is common, always double-check your owner’s manual. Using too little oil leads to rapid engine wear, while too much can cause excessive smoke and carbon buildup.
The Right Oil: Don’t skimp on oil. Use a high-quality, two-stroke oil specifically designed for air-cooled engines. Synthetic oils are generally superior, providing better lubrication and cleaner burning.
Mixing Techniques: I always recommend using a dedicated fuel mixing container with marked ratios. Pour the oil in first, then add the gasoline. This helps ensure proper mixing. Shake the container vigorously before each use.
Fuel Freshness: Gasoline degrades over time, especially when mixed with oil. Don’t use fuel that’s been sitting around for more than a month or two. Old fuel can cause starting problems and poor performance.
Ethanol Concerns: Modern gasoline often contains ethanol, which can damage small engines. If possible, use ethanol-free gasoline or add a fuel stabilizer specifically designed to combat the effects of ethanol.
My Experience: One time, I used a cheap, no-name two-stroke oil in my 49SP. The saw ran terribly, smoked like a chimney, and eventually seized up. Lesson learned: always use quality oil.

Actionable Steps:

Consult your Jonsered 49SP owner’s manual for the recommended fuel-to-oil ratio.
Purchase a high-quality, two-stroke oil designed for air-cooled engines.
Use a dedicated fuel mixing container to ensure accurate ratios.
Mix fuel fresh, and avoid using fuel that’s been sitting for more than a month.
Consider using ethanol-free gasoline or a fuel stabilizer.

Takeaway: The fuel mix is the lifeblood of your 49SP. Get it right, and your saw will thank you with years of reliable service.

Tip 2: Chain Sharpening – The Key to Effortless Cutting

A dull chain is a dangerous chain. It requires more effort to cut, increases the risk of kickback, and puts unnecessary strain on your saw. A sharp chain, on the other hand, glides through wood with ease, making your work faster, safer, and more enjoyable.

Understanding Chain Anatomy: Before you can sharpen a chain, you need to understand its components. Each cutting tooth consists of a cutter, a depth gauge (or raker), and a tie strap. The cutter does the actual cutting, while the depth gauge controls the depth of the cut.
Sharpening Tools: There are several ways to sharpen a chainsaw chain. The most common methods include:
- Hand Filing: This is the most portable and affordable method. It requires a round file (typically 5/32″ for the 49SP), a flat file for the depth gauges, and a filing guide to maintain the correct angles.
- Electric Chain Sharpener: This is a faster and more precise method, but it requires a power source.
- Grinding Wheel: This is the fastest method, but it can also be the most aggressive. It’s best left to experienced sharpeners.
Sharpening Technique:
1. Secure the chain in a vise or use a chain vise attached to your stump.
2. Use the round file and filing guide to sharpen each cutter, maintaining the correct angle and depth. The filing guide will indicate the correct angle for your chain.
3. File each cutter evenly, removing the same amount of material from each.
4. Use the flat file to lower the depth gauges (rakers) according to the manufacturer’s specifications. A depth gauge tool is helpful for this. Typically, you want to lower them by about 0.025″ (0.635mm).
When to Sharpen: Sharpen your chain whenever it starts to feel dull. Signs of a dull chain include:
- Producing fine sawdust instead of chips.
- Requiring more pressure to cut.
- Cutting unevenly or pulling to one side.
- Smoking excessively.
My Experience: I once spent an entire day struggling to fell a small tree with a dull chain. I was exhausted, frustrated, and the saw was overheating. After finally sharpening the chain, the tree practically fell itself.

Actionable Steps:

Inspect your chain regularly for signs of dullness.
Invest in a quality sharpening kit that includes a round file, a flat file, a filing guide, and a depth gauge tool.
Learn the proper sharpening technique, either through online tutorials or by consulting a professional.
Sharpen your chain regularly, even if it doesn’t feel completely dull. A slightly sharp chain is always better than a completely dull one.

Takeaway: A sharp chain is essential for safe and efficient woodcutting. Learn how to sharpen your chain properly, and you’ll save yourself time, energy, and potential injury.

Tip 3: Carburetor Adjustment – Fine-Tuning for Peak Performance

The carburetor is responsible for mixing air and fuel in the correct proportions. Over time, the carburetor can become clogged or misadjusted, leading to poor performance, difficult starting, and excessive fuel consumption. Adjusting the carburetor can restore your 49SP to its former glory.

Understanding Carburetor Components: Most carburetors have 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): Controls the engine’s idle speed.
Safety First: Before adjusting the carburetor, make sure the chain brake is engaged and the saw is on a stable surface.
The Procedure:
1. Warm-Up: Start the saw and let it warm up for a few minutes.
2. Idle Speed Adjustment: Turn the LA screw until the engine idles smoothly without the chain spinning. If the chain spins at idle, turn the screw counterclockwise until it stops.
3. Low-Speed Adjustment: Turn the L screw slowly clockwise until the engine starts to stumble or die. Then, turn it counterclockwise until the engine runs smoothly and accelerates quickly.
4. High-Speed Adjustment: This is the trickiest adjustment. Turn the H screw clockwise to lean the mixture (less fuel) and counterclockwise to richen the mixture (more fuel). You want to find the sweet spot where the engine runs smoothly at full throttle without bogging down or sounding strained. Listen for a “four-stroking” sound, which indicates a slightly rich mixture.
Important Note: Making small adjustments is important. A quarter of a turn can make a big difference. If you’re unsure, consult a professional.
My Experience: I once spent hours trying to start my 49SP after it had been sitting for a while. After cleaning the carburetor and making some minor adjustments, it fired right up.

Actionable Steps:

Familiarize yourself with the location of the carburetor adjustment screws on your 49SP.
Start with small adjustments, and test the saw after each adjustment.
Listen to the engine carefully, and pay attention to any changes in performance.
If you’re unsure about any of the adjustments, consult a professional mechanic.
Consider purchasing a carburetor adjustment tool for easier access to the screws.

Takeaway: Carburetor adjustment is a crucial skill for maintaining the performance of your Jonsered 49SP. With a little practice, you can fine-tune your saw for optimal power and efficiency.

Tip 4: Oiling System – Keeping the Chain Lubricated

Proper chain lubrication is essential for preventing premature wear and tear on the chain and bar. A dry chain will quickly overheat, causing it to stretch, dull, and eventually break.

Checking the Oiler: Before each use, check the oil level in the oil tank. Make sure the tank is filled with a good quality bar and chain oil.
Adjusting the Oiler: The Jonsered 49SP has an adjustable oiler, which allows you to control the amount of oil delivered to the chain. Adjust the oiler according to the type of wood you’re cutting and the bar length. Harder woods and longer bars require more oil.
Testing the Oiler: To test the oiler, start the saw and hold the bar a few inches above a piece of cardboard or wood. You should see a steady stream of oil being ejected from the chain.
Cleaning the Oiler: Over time, the oiler can become clogged with debris. Clean the oiler regularly to ensure proper lubrication. The oiler is typically located near the base of the bar and can be accessed by removing the bar and chain. Use compressed air or a small brush to clean the oiler port.
My Experience: I once neglected to check the oil level in my 49SP and ended up running the saw with a dry chain. The chain quickly overheated and stretched, ruining both the chain and the bar.

Actionable Steps:

Check the oil level in the oil tank before each use.
Adjust the oiler according to the type of wood you’re cutting and the bar length.
Test the oiler regularly to ensure proper lubrication.
Clean the oiler periodically to prevent clogging.
Use a high-quality bar and chain oil.

Takeaway: Proper chain lubrication is crucial for extending the life of your chain and bar. Make sure to check the oil level, adjust the oiler, and clean the oiler regularly.

Tip 5: Saw Maintenance – Preventing Problems Before They Start

Regular maintenance is the key to keeping your Jonsered 49SP running smoothly for years to come. Neglecting maintenance can lead to costly repairs and downtime.

Air Filter Cleaning: The air filter prevents dust and debris from entering the engine. Clean the air filter regularly, especially in dusty conditions. Use compressed air or wash it with soap and water.
Spark Plug Inspection: Inspect the spark plug regularly for signs of wear or fouling. Replace the spark plug if it’s damaged or worn. The correct spark plug gap for the 49SP is typically around 0.020″ (0.5mm).
Fuel Filter Replacement: The fuel filter prevents debris from entering the carburetor. Replace the fuel filter annually or more often if you notice starting problems.
Bar Maintenance: Keep the bar clean and free of debris. Remove any burrs or nicks with a flat file. Check the bar rails for wear and tear. If the rails are worn, the bar may need to be replaced.
Chain Tension Adjustment: Adjust the chain tension regularly to prevent the chain from derailing or binding. The chain should be snug on the bar but still able to be pulled around by hand.
Storage: When storing your 49SP for extended periods, drain the fuel tank and run the saw until it stalls. This will prevent the fuel from gumming up the carburetor. Remove the spark plug and pour a small amount of two-stroke oil into the cylinder. Pull the starter cord a few times to distribute the oil. Store the saw in a dry place.
My Experience: I once neglected to clean the air filter on my 49SP, and the engine quickly lost power. After cleaning the filter, the saw ran like new.

Actionable Steps:

Clean the air filter regularly.
Inspect the spark plug periodically and replace it when necessary.
Replace the fuel filter annually.
Maintain the bar by cleaning it and removing any burrs or nicks.
Adjust the chain tension regularly.
Store the saw properly when not in use.
Create a maintenance schedule and stick to it.

Takeaway: Regular maintenance is essential for keeping your Jonsered 49SP running smoothly and reliably. By following these simple maintenance tips, you can prevent problems before they start and extend the life of your saw.

Pro Woodcutting Hacks: Taking Your Skills to the Next Level

Now that we’ve covered the basics of chainsaw maintenance and operation, let’s move on to some pro woodcutting hacks that will help you take your skills to the next level.

Hack 1: The Bore Cut Technique

The bore cut is an advanced felling technique that allows you to control the direction of the fall more precisely. It’s particularly useful when felling trees in tight spaces or when you need to avoid obstacles.

The Setup: Make a standard face cut on the side of the tree you want it to fall.
The Bore: Instead of making a back cut, plunge the tip of the bar into the tree behind the face cut. Be careful to avoid kickback.
Creating the Hinge: Once the bar is fully inserted, pivot the saw to create a hinge of wood that will control the fall.
The Final Cut: Make a final cut from the back of the tree to the bore cut, leaving the hinge intact.
The Fall: As you make the final cut, the tree will begin to fall in the direction of the face cut.

Caution: The bore cut is a dangerous technique that should only be attempted by experienced chainsaw operators. Always be aware of your surroundings and take precautions to avoid kickback.

Hack 2: The Hinge Technique

The hinge is the key to controlling the direction of the fall. The wider the hinge, the more control you have.

Width: The width of the hinge should be approximately 80% of the tree’s diameter.
Thickness: The thickness of the hinge should be about 10% of the tree’s diameter.
Placement: The hinge should be placed directly behind the face cut.

Hack 3: Using Wedges for Directional Felling

Wedges are invaluable tools for directional felling, especially for leaning trees.

Placement: Drive wedges into the back cut behind the hinge to lift the tree in the desired direction.
Types of Wedges: Plastic wedges are safer than steel wedges, as they are less likely to damage the chain if you accidentally hit them.
Multiple Wedges: Use multiple wedges for larger trees.

Hack 4: Understanding Wood Types and Cutting Techniques

Different types of wood require different cutting techniques. Hardwoods like oak and maple are denser and require more power to cut than softwoods like pine and fir.

Hardwoods: Use a sharp chain and a steady cutting speed. Avoid forcing the saw, as this can cause it to bind.
Softwoods: Cut with a faster speed, but be careful to avoid kickback.

Hack 5: Limb Removal Techniques

Removing limbs safely and efficiently is crucial for both felling and bucking.

Top Limbs: Cut top limbs from the bottom up to avoid being hit by falling branches.
Bottom Limbs: Cut bottom limbs from the top down to prevent the bar from pinching.
Spring Poles: Be extremely careful when cutting spring poles, as they can snap back with tremendous force.

Actionable Steps:

Practice the bore cut technique on small, non-essential trees.
Experiment with different hinge widths and thicknesses to see how they affect the direction of the fall.
Invest in a set of wedges and learn how to use them properly.
Familiarize yourself with the different types of wood and their cutting characteristics.
Practice safe limbing techniques to avoid injury.

Takeaway: By mastering these pro woodcutting hacks, you can take your chainsaw skills to the next level and become a more efficient and safer woodcutter.

Safety First: A Non-Negotiable

I’ve seen too many accidents in the woods to ever downplay the importance of safety. Chainsaws are powerful tools, and they demand respect. Here’s a quick rundown:

Personal Protective Equipment (PPE): Always wear a helmet, eye protection, hearing protection, gloves, chainsaw chaps, and sturdy boots. No exceptions.
Clear Work Area: Before starting the saw, clear the work area of any obstacles, such as rocks, branches, or people.
Know Your Saw: Familiarize yourself with the saw’s controls and safety features.
Kickback Awareness: Be aware of the risk of kickback, and take precautions to avoid it.
Proper Stance: Maintain a stable stance and keep both hands on the saw.
Don’t Overreach: Avoid overreaching or cutting above shoulder height.
Rest Breaks: Take frequent rest breaks to avoid fatigue.
First Aid Kit: Always have a well-stocked first aid kit on hand.
Communication: If working with others, establish clear communication signals.

Actionable Steps:

Invest in high-quality PPE.
Develop a pre-work safety checklist.
Take a chainsaw safety course.
Never work alone.

Takeaway: Safety is paramount when operating a chainsaw. Always prioritize safety, and never take shortcuts.

Conclusion: The Jonsered 49SP – A Classic Worth Mastering

The Jonsered 49SP is a classic chainsaw that, with proper care and maintenance, can provide years of reliable service. By following these tips and hacks, you can unlock the full potential of your 49SP and become a more efficient and safer woodcutter. Remember to prioritize safety, practice regularly, and never stop learning. Now get out there and make some sawdust! And for goodness’ sake, don’t set your beard on fire. I mean it.

49SP Jonsered Chainsaw Tips (5 Pro Woodcutting Hacks)