Stihl 090 Chainsaw For Sale (5 Pro Tips To Spot Vintage Finds)

The Stihl 090 chainsaw. The very name evokes images of raw power, vintage machinery, and the kind of projects that make other chainsaws tremble in fear. For those of us in the wood processing and firewood preparation world, finding a well-maintained Stihl 090 is like uncovering a gold nugget. It’s not just a chainsaw; it’s a piece of logging history.

Why the fuss about a vintage chainsaw? Well, in today’s world of cost-effectiveness, where disposable tools often reign supreme, the Stihl 090 represents a different philosophy: build it to last. These saws were designed for heavy-duty logging, capable of felling massive trees that would bring modern, smaller saws to their knees. Buying a used Stihl 090, if you can find one in good condition, can be a surprisingly cost-effective way to get serious cutting power without breaking the bank on a brand-new, equally powerful (and expensive) professional saw. The key is knowing what to look for.

In this guide, I’ll share my years of experience in the logging and firewood industry, focusing on how to identify a worthwhile Stihl 090 for sale and avoid getting stuck with a lemon. I’ve spent countless hours working with chainsaws, from felling timber in the Pacific Northwest to processing firewood in the heart of the Appalachian Mountains. I’ve seen firsthand what makes a chainsaw last and what causes it to fail. This knowledge, combined with specific insights on the Stihl 090, will help you make an informed decision.

Finding a Stihl 090: A Treasure Hunt

The Stihl 090 is a sought-after machine. They aren’t produced anymore, so the hunt for one becomes a bit of a treasure hunt. You’ll primarily be looking at online marketplaces (eBay, Craigslist, Facebook Marketplace), auction sites, and potentially even word-of-mouth within logging communities.

Understanding the Stihl 090: Key Specs and Features

Before diving into the inspection process, let’s establish a baseline understanding of what makes the Stihl 090 tick. This saw, often nicknamed the “Contra” or “Lightning,” is characterized by:

Engine Size: Typically ranging from 106cc to 137cc, depending on the specific variant. This is where the power comes from!
Weight: A beast, weighing in around 25-30 lbs (without the bar and chain). Prepare for a workout.
Bar Length: Capable of handling very long bars, often exceeding 36 inches. This is crucial for felling large trees.
Design: Known for its robust construction and simple, yet effective, design. These saws were built to be field-maintained.
Availability: Discontinued, making them collectible and potentially valuable.

Pro Tip #1: The Initial Assessment – Photos and Communication

The first step is always the initial assessment based on photos and communication with the seller. This is your chance to weed out the obvious duds and gather crucial information before investing time and travel.

1. The Power of Photos:

Overall Condition: Look for clear, well-lit photos from multiple angles. Are there any obvious signs of damage, like cracks in the housing, missing parts, or excessive rust?
Close-Ups: Request close-up photos of key areas: the cylinder fins (for cooling), the carburetor, the spark plug, and the chain brake mechanism.
Bar and Chain: Examine the bar for wear and tear. Is it straight? Are the rails in good condition? Check the chain for sharpness and missing cutters. A worn bar or dull chain can indicate a lack of maintenance.
Originality: Does the saw appear to be mostly original? While some replacement parts are inevitable, a heavily modified saw might indicate a history of problems.

2. The Art of Asking Questions:

Usage History: How often was the saw used? What kind of work was it used for? A saw that was used commercially for logging will likely have more wear and tear than one that was used occasionally for firewood.
Maintenance Record: Has the saw been regularly serviced? When was the last time it was tuned up? Has the carburetor been rebuilt? Regular maintenance is crucial for the longevity of any chainsaw.
Known Issues: Are there any known problems with the saw? Does it start easily? Does it idle smoothly? Does it smoke excessively? Be wary of sellers who are evasive or unwilling to answer these questions directly.
Reason for Selling: Why are they selling the saw? Are they upgrading to a newer model? Are they downsizing? Or is there a more concerning reason, like the saw being unreliable?
Compression Test: Has a compression test been performed? (More on this later).
Paperwork: Do they have any original manuals or documentation? This can be a bonus, as it shows the seller cared about the saw.

My Experience: I once drove three hours to look at a Stihl 090 that looked promising in the photos. However, when I arrived, it was clear the seller had misrepresented the condition. The saw was covered in rust, the chain brake was broken, and the engine wouldn’t even turn over. Don’t be afraid to walk away if something doesn’t feel right.

Pro Tip #2: The Compression Test – The Heart of the Matter

The compression test is arguably the most crucial test you can perform to assess the health of a chainsaw engine. It measures the pressure inside the cylinder when the piston is compressed, indicating the condition of the piston rings, cylinder walls, and valves (if applicable).

Why is Compression Important?

Low compression means that the engine isn’t sealing properly, leading to:

Reduced Power: The engine won’t be able to generate as much power, making it difficult to cut through wood.
Hard Starting: The engine may be difficult or impossible to start.
Poor Fuel Efficiency: The engine will burn more fuel to produce the same amount of power.
Increased Wear and Tear: Low compression can accelerate wear on other engine components.

How to Perform a Compression Test:

You’ll need a compression tester, which can be purchased at most auto parts stores. Here’s the basic procedure:

Warm-Up (Optional): Ideally, the engine should be slightly warm for a more accurate reading, but this isn’t always practical with a used saw.
Remove Spark Plug: Disconnect the spark plug wire and remove the spark plug using a spark plug wrench.
Insert Compression Tester: Screw the compression tester into the spark plug hole.
Pull the Starter Cord: Pull the starter cord repeatedly (5-10 times) until the needle on the compression tester stops rising.
Record the Reading: Note the compression reading on the gauge.

Interpreting the Results:

Stihl 090 Target Compression: For a Stihl 090, a healthy engine should have a compression reading of at least 120 PSI (pounds per square inch). Ideally, you’d want to see 130-150 PSI.
Acceptable Range: Anything below 120 PSI is a red flag. A reading between 100-120 PSI might indicate some wear, but the saw could still be usable with some maintenance.
Unacceptable Range: Anything below 100 PSI indicates significant wear and tear, and the saw is likely to require a major overhaul.

Important Considerations:

Consistency: The consistency of the readings is also important. If the compression reading fluctuates wildly, it could indicate a problem with the compression tester or the engine.
Leak-Down Test (Advanced): For a more thorough assessment, you can perform a leak-down test. This involves pressurizing the cylinder with compressed air and listening for leaks coming from the exhaust port, carburetor, or crankcase. This test can help pinpoint the source of compression loss.

Case Study: I once bought a Stihl 090 that had a compression reading of only 90 PSI. I knew it was a gamble, but the price was right. I ended up rebuilding the engine with new piston rings and a honed cylinder. The compression jumped up to 140 PSI, and the saw ran like new. However, this required a significant investment of time and money.

Pro Tip #3: The Visual Inspection – Details Matter

A thorough visual inspection can reveal a wealth of information about the saw’s history and condition. Don’t rush this step. Take your time and examine every detail.

1. Fuel and Oil Tanks:

Cracks and Leaks: Check for any cracks or leaks in the fuel and oil tanks. These can be difficult and expensive to repair.
Fuel Lines: Inspect the fuel lines for cracks or deterioration. Old fuel lines can become brittle and leak, causing starting problems and potential fire hazards.
Fuel Filter: Check the fuel filter to see if it’s clean. A clogged fuel filter can restrict fuel flow and cause the engine to run lean.

2. Carburetor:

Condition: Look for any signs of damage or corrosion.
Adjustments: Are the carburetor adjustment screws intact? Have they been tampered with?
Rebuild: Has the carburetor been recently rebuilt? A rebuilt carburetor is a plus, as it indicates the seller has taken care of the saw.

3. Cylinder and Piston:

Scoring: Look for scoring (scratches) on the cylinder walls. This can indicate a lack of lubrication or overheating. You’ll need to remove the muffler to get a good look at the cylinder.
Piston Condition: Inspect the piston for signs of wear or damage. You can usually see the piston through the exhaust port.
Fin Damage: Check the cylinder fins for damage. Broken or missing fins can reduce cooling efficiency and lead to overheating.

4. Ignition System:

Spark Plug: Inspect the spark plug for wear and fouling. A fouled spark plug can indicate a problem with the fuel mixture or ignition system.
Spark Plug Wire: Check the spark plug wire for cracks or damage.
Ignition Module: The ignition module is responsible for generating the spark that ignites the fuel mixture. If the ignition module is faulty, the saw won’t start.

5. Clutch and Chain Brake:

Clutch Condition: Inspect the clutch shoes for wear. Worn clutch shoes can cause the chain to slip.
Chain Brake Functionality: Test the chain brake to make sure it engages and disengages properly. A malfunctioning chain brake is a safety hazard.

6. Bar and Chain:

Bar Wear: Check the bar for wear and tear. Is it straight? Are the rails in good condition?
Chain Sharpness: Check the chain for sharpness and missing cutters. A dull chain can be dangerous and inefficient.
Chain Tension: Make sure the chain tension is properly adjusted.

7. Muffler:

Condition: Inspect the muffler for rust or damage.
Spark Arrestor Screen: Check the spark arrestor screen to make sure it’s clean. A clogged spark arrestor screen can restrict exhaust flow and cause the engine to overheat.

Measurements and Specifications:

While a detailed measurement of every component is impractical during an inspection, here are a few key areas to consider:

Bar Rail Gauge: Measure the bar rail gauge with a caliper. It should match the gauge of the chain.
Chain Pitch: Determine the chain pitch (e.g., .404″, 3/8″). This will ensure you can find replacement chains.
Cylinder Fin Spacing: Visually assess the cylinder fin spacing. Excessive debris buildup can restrict airflow.

Personalized Insight: I always carry a small mirror and a flashlight with me when inspecting chainsaws. This allows me to get a better view of hard-to-reach areas, like the cylinder walls and the underside of the carburetor.

Pro Tip #4: The Starting and Running Test – Listen Carefully

The starting and running test is your opportunity to assess the engine’s performance under real-world conditions. This is where you’ll uncover any hidden problems that weren’t apparent during the visual inspection.

1. Starting Procedure:

Cold Start: Observe the starting procedure. Does the saw start easily after a few pulls? Or does it require excessive cranking?
Warm Start: Once the engine is warm, try starting it again. Does it start easily? Or does it hesitate?
Choke: Does the choke work properly? Does the engine stall when the choke is engaged?

2. Idling:

Smoothness: Does the engine idle smoothly? Or does it sputter or stall?
RPM: Does the engine idle at the correct RPM? (Consult the owner’s manual for the recommended idle speed).
Smoke: Is there excessive smoke coming from the exhaust? Blue smoke indicates burning oil, while black smoke indicates a rich fuel mixture.

3. Acceleration:

Throttle Response: How quickly does the engine respond to the throttle? Does it hesitate or bog down?
Power: Does the engine have sufficient power? Does it bog down when you apply load?
Cutting Test (If Possible): If possible, ask the seller if you can perform a cutting test. This will give you a better sense of the saw’s power and performance.

4. Chain Oiler:

Functionality: Does the chain oiler work properly? Is oil being delivered to the bar and chain?
Flow Rate: Is the oil flow rate adjustable?

5. Listening for Unusual Noises:

Knocking: A knocking sound could indicate a problem with the connecting rod or crankshaft.
Rattling: A rattling sound could indicate a loose component or worn bearings.
Squealing: A squealing sound could indicate a problem with the clutch or bearings.

My Story: I once bought a Stihl 090 that started easily and idled smoothly. However, when I applied the throttle, the engine bogged down and wouldn’t rev up properly. I later discovered that the carburetor was severely clogged with dirt and debris.

Important Safety Note: Always wear appropriate safety gear, including eye protection and hearing protection, when starting and running a chainsaw.

Pro Tip #5: Parts Availability and Price – The Long-Term Perspective

Before making a final decision, it’s crucial to consider the availability of replacement parts and the overall price of the saw. A cheap saw that’s difficult to repair can end up costing you more in the long run.

1. Parts Availability:

Original Parts: Original Stihl 090 parts can be difficult to find and expensive.
Aftermarket Parts: Aftermarket parts are more readily available, but the quality can vary.
Online Resources: Online forums and communities can be valuable resources for finding parts and information.

2. Price Considerations:

Condition: The price of a Stihl 090 will vary depending on its condition. A saw in excellent condition will command a higher price than a saw that needs work.
Location: The location of the saw can also affect the price. Saws in areas with a strong logging history may be more expensive.
Market Value: Research the current market value of Stihl 090 chainsaws to get a sense of what’s a fair price.

3. Repair Costs:

Estimate Repair Costs: Before buying a saw that needs work, get an estimate of the repair costs. This will help you determine if it’s worth the investment.
DIY vs. Professional Repair: Are you comfortable performing the repairs yourself? Or will you need to hire a professional?

Strategic Advantages:

Negotiation: Don’t be afraid to negotiate the price. Point out any flaws or issues that you’ve identified during the inspection.
Patience: Be patient. Finding a good Stihl 090 can take time. Don’t settle for the first saw you find.

Data and Statistics:

Average Price Range: A Stihl 090 in good working condition typically sells for between $800 and $2000, depending on its condition and location.
Repair Costs: A major engine overhaul can cost anywhere from $500 to $1000, depending on the extent of the damage.

Case Study: I once passed on a Stihl 090 that was priced very low because I knew it needed a complete engine rebuild. The cost of the rebuild, combined with the initial purchase price, would have exceeded the market value of a saw in good condition.

Beyond the Sale: Maintaining Your Vintage Powerhouse

Once you’ve acquired your Stihl 090, the real work begins: keeping it running. These saws are robust, but they require diligent maintenance to ensure peak performance and longevity.

Fuel and Oil: The Lifeblood of Your Saw

Fuel Mixture: The Stihl 090 typically requires a fuel mixture of 50:1 (gasoline to two-stroke oil). Use high-quality two-stroke oil specifically designed for air-cooled engines.
Fuel Storage: Store fuel in a clean, airtight container. Old fuel can become stale and cause starting problems.
Chain Oil: Use a high-quality bar and chain oil. This will help lubricate the bar and chain, reducing wear and tear.
Oil Level: Check the chain oil level frequently and refill as needed.

Air Filter: Breathing Easy

Cleaning: Clean the air filter regularly. A dirty air filter can restrict airflow and cause the engine to run lean.
Replacement: Replace the air filter when it becomes excessively dirty or damaged.

Spark Plug: Igniting the Fire

Inspection: Inspect the spark plug regularly for wear and fouling.
Cleaning: Clean the spark plug with a wire brush.
Replacement: Replace the spark plug according to the manufacturer’s recommendations.

Carburetor: Fine-Tuning Performance

Adjustment: The carburetor may need to be adjusted periodically to ensure optimal performance. Consult the owner’s manual for instructions on how to adjust the carburetor.
Rebuild: If the carburetor becomes excessively dirty or damaged, it may need to be rebuilt.

Chain and Bar: The Cutting Edge

Sharpening: Sharpen the chain regularly. A dull chain is dangerous and inefficient.
Bar Maintenance: Clean the bar regularly and check for wear and tear.
Chain Tension: Adjust the chain tension properly. A chain that is too loose can derail, while a chain that is too tight can cause excessive wear.

Storage: Protecting Your Investment

Cleaning: Clean the saw thoroughly before storing it.
Fuel: Drain the fuel tank or add a fuel stabilizer to prevent the fuel from going stale.
Oil: Empty the chain oil tank.
Storage Location: Store the saw in a clean, dry place.

Safety First: Respecting the Power

The Stihl 090 is a powerful machine, and it’s essential to prioritize safety when operating it.

Personal Protective Equipment (PPE): Always wear appropriate PPE, including:
- Eye protection (safety glasses or goggles)
- Hearing protection (earplugs or earmuffs)
- Gloves
- Chaps
- Steel-toed boots
Safe Cutting Techniques: Use proper cutting techniques to avoid kickback and other hazards.
Clearance: Ensure that there is adequate clearance around the cutting area.
Fatigue: Avoid operating the saw when you are tired or fatigued.
Maintenance: Keep the saw in good working condition.
Training: Get proper training on how to operate a chainsaw safely.

Conclusion: A Legacy of Power

The Stihl 090 chainsaw is more than just a tool; it’s a piece of logging history. Finding one in good condition can be a rewarding experience, but it requires careful inspection and a thorough understanding of the saw’s mechanics. By following the pro tips outlined in this guide, you can increase your chances of finding a worthwhile Stihl 090 and avoid getting stuck with a lemon. Remember to prioritize safety and maintain your saw properly to ensure years of reliable service.

Now, get out there and start your treasure hunt! The satisfaction of wielding a vintage Stihl 090, feeling its raw power as it effortlessly cuts through wood, is an experience unlike any other. Good luck, and happy cutting!