Symbol for Choke on Stihl Chainsaws (5 Pro Tips Inside)

Are you staring at your Stihl chainsaw, scratching your head, and wondering what that little symbol next to the choke lever actually means? Don’t worry, you’re not alone! Understanding your chainsaw’s choke is crucial for easy starts and optimal performance. In this article, I’ll not only decode that cryptic symbol but also give you five pro tips to master your Stihl chainsaw’s choke, saving you time, frustration, and potentially, a lot of money in the long run.

What Does the Stihl Chainsaw Choke Symbol Mean?

The choke symbol on a Stihl chainsaw usually depicts a partially closed butterfly valve. This symbol indicates that the choke, when engaged, restricts airflow into the carburetor. The exact representation might vary slightly depending on the Stihl model, but the underlying principle remains the same.

• Function: The choke enriches the fuel-air mixture, providing a richer, more combustible mixture necessary for starting a cold engine.

• Why it Matters: Cold engines need a richer mixture because fuel doesn’t vaporize as easily at lower temperatures. The choke compensates for this.

Understanding the Carburetor and Its Role

Before we get into the nitty-gritty of the choke, let’s quickly review the carburetor’s role. The carburetor mixes air and fuel in the correct proportions to create a combustible mixture for the engine. When the engine is cold, this mixture needs to be richer in fuel.

• Air/Fuel Ratio: The ideal air/fuel ratio for combustion is around 14.7:1 (air to fuel). During a cold start, this ratio needs to be significantly richer, perhaps closer to 10:1.

• Choke’s Influence: The choke effectively reduces the amount of air entering the carburetor, thereby increasing the fuel concentration.

Pro Tip #1: Identifying Your Stihl Model and Its Specific Choke System

Stihl offers a wide range of chainsaws, from small homeowner models to professional logging saws. While the fundamental principle of the choke remains the same, the specific mechanism and operation can vary.

• Owner’s Manual is Key: Always consult your Stihl chainsaw’s owner’s manual. It provides detailed instructions and diagrams specific to your model. I can’t stress this enough. The manual is your bible for your saw.

• Model-Specific Features: Some Stihl models feature automatic chokes, while others have manual levers or even a combination of both. Knowing your model’s specific system is crucial.

• My Experience: I remember once struggling to start a friend’s Stihl MS 261. After much frustration, I realized it had a slightly different choke mechanism than my MS 271. A quick peek at the manual saved the day.

Step-by-Step Guide: Using the Choke Correctly

Here’s a detailed, step-by-step guide on how to use the choke on your Stihl chainsaw effectively:

1. Cold Start:

   • Engage the Choke: Locate the choke lever and move it to the fully engaged position. This is usually indicated by the choke symbol.
   • Pull the Starter Cord: Grip the starter handle firmly and pull it sharply until the engine sputters or tries to start. Don’t yank it out all the way; a smooth, controlled pull is key.
   • Disengage the Choke (Partially): Once the engine sputters, move the choke lever to the intermediate position (if your model has one) or disengage it completely. This allows a leaner mixture for sustained running.
   • Pull the Starter Cord Again: Continue pulling the starter cord until the engine starts and runs smoothly.

2. Warm Start:

   • No Choke Needed: If the engine is warm (has been running recently), you typically don’t need to use the choke.
   • Slightly Warm: If the engine is slightly warm, you might need to engage the choke briefly and then disengage it immediately after the engine sputters.

3. Flooded Engine:

   • Disable the Choke: If you’ve flooded the engine (too much fuel), disable the choke completely.
   • Pull the Starter Cord Repeatedly: Pull the starter cord repeatedly with the throttle open to clear the excess fuel from the cylinder.

Pro Tip #2: Recognizing the Signs of a Flooded Engine

Flooding is a common issue, especially for beginners. Recognizing the signs early can save you a lot of trouble.

• Symptoms: A flooded engine will usually refuse to start, even after multiple pulls of the starter cord. You might also smell a strong odor of gasoline.

• Clearing a Flooded Engine: As mentioned above, disable the choke and pull the starter cord repeatedly with the throttle open. This allows air to enter the cylinder and evaporate the excess fuel.

• My Experience: I once flooded my chainsaw so badly that I had to remove the spark plug and let the cylinder air out for a few hours. It was a valuable lesson in choke management!

Pro Tip #3: Maintaining Your Chainsaw for Optimal Choke Performance

Proper maintenance is crucial for ensuring your chainsaw starts easily and runs smoothly.

• Clean Air Filter: A dirty air filter restricts airflow, which can mimic the effects of a choke being engaged when it shouldn’t be. Clean or replace the air filter regularly.

  • Cost of Air Filter: A new air filter for a Stihl chainsaw typically costs between $5 and $15, depending on the model.

• Fresh Fuel: Old fuel can degrade and become gummy, clogging the carburetor and affecting the choke’s performance. Always use fresh, high-quality fuel mixed with the correct ratio of two-stroke oil.

  • Fuel Cost: The cost of premium gasoline varies widely by region, but you can expect to pay around $3 to $5 per gallon. Two-stroke oil typically costs between $10 and $20 per quart.

• Spark Plug Condition: A fouled or worn spark plug can make starting difficult. Inspect and replace the spark plug as needed.

  • Cost of Spark Plug: A new spark plug for a Stihl chainsaw usually costs between $5 and $10.

• Carburetor Cleaning: Over time, the carburetor can become clogged with deposits. Cleaning or rebuilding the carburetor may be necessary.

  • Cost of Carburetor Cleaning: Carburetor cleaning kits typically cost between $10 and $20. Professional carburetor cleaning can cost between $50 and $100.

• Fuel Line Inspection: Check the fuel lines for cracks or leaks. Damaged fuel lines can affect fuel delivery and choke performance.

Pro Tip #4: Adjusting the Carburetor for Optimal Performance

Carburetor adjustment can significantly impact your chainsaw’s performance, especially in relation to the choke.

• Understanding Carburetor Screws: Most Stihl chainsaws have three adjustment screws:

  • L (Low): Adjusts the fuel mixture at low speeds.
  • H (High): Adjusts the fuel mixture at high speeds.
  • LA (Low Idle): Adjusts the idle speed.

• Factory Settings: It’s best to start with the factory settings recommended in your owner’s manual.

• Fine-Tuning:

  • Too Lean: If the engine hesitates or stalls when you open the throttle, the mixture is likely too lean. Turn the L screw counterclockwise slightly to richen the mixture.
  • Too Rich: If the engine smokes excessively or bogs down at high speeds, the mixture is likely too rich. Turn the H screw clockwise slightly to lean the mixture.

• Professional Adjustment: If you’re not comfortable adjusting the carburetor yourself, it’s best to take it to a qualified technician.

  • Cost of Professional Adjustment: Professional carburetor adjustment typically costs between $50 and $100.

Pro Tip #5: Troubleshooting Common Choke-Related Issues

Even with proper technique, you might encounter issues related to the choke. Here’s how to troubleshoot some common problems:

• Engine Won’t Start with Choke:

  • Possible Causes: Flooded engine, dirty air filter, old fuel, faulty spark plug.
  • Troubleshooting Steps: Follow the steps for clearing a flooded engine, check the air filter, use fresh fuel, and inspect the spark plug.

• Engine Starts with Choke but Stalls When Disengaged:

  • Possible Causes: Lean fuel mixture, clogged carburetor, vacuum leak.
  • Troubleshooting Steps: Adjust the L screw to richen the fuel mixture, clean the carburetor, and inspect the fuel lines and intake manifold for leaks.

• Engine Runs Rough with Choke Engaged:

  • Possible Causes: Rich fuel mixture, faulty choke mechanism.
  • Troubleshooting Steps: Disengage the choke as soon as the engine starts, inspect the choke lever and linkage for proper operation, and adjust the H screw to lean the fuel mixture.

The Cost of Neglecting Your Chainsaw’s Choke

Ignoring the proper use and maintenance of your chainsaw’s choke can lead to a cascade of problems, ultimately costing you time and money.

• Increased Fuel Consumption: Running the engine with the choke engaged for too long results in a richer fuel mixture, leading to increased fuel consumption.

  • Fuel Cost Impact: An extra gallon of fuel per week can easily add up to $150-$250 per year, depending on fuel prices.

• Engine Damage: Running a consistently rich fuel mixture can lead to carbon buildup in the cylinder and on the spark plug, potentially causing engine damage.

  • Repair Costs: Engine repairs can range from $100 for a simple cylinder cleaning to $500 or more for a complete engine rebuild.

• Reduced Lifespan: Neglecting maintenance and proper choke usage can shorten the lifespan of your chainsaw.

  • Replacement Cost: A new Stihl chainsaw can cost anywhere from $200 for a small homeowner model to $1000 or more for a professional logging saw.

• Increased Downtime: Troubleshooting starting problems and performing repairs takes time away from your wood processing or firewood preparation projects.

  • Opportunity Cost: The time spent troubleshooting and repairing your chainsaw could be spent cutting wood, splitting logs, or earning money.

Budgeting for Chainsaw Maintenance

To avoid unexpected repair costs and ensure your chainsaw remains in top condition, it’s essential to budget for regular maintenance.

• Annual Maintenance Budget: I recommend setting aside at least $50-$100 per year for chainsaw maintenance.

• Maintenance Schedule:

  • Every Use: Check the air filter, fuel level, and chain tension.
  • Monthly: Clean the air filter, inspect the spark plug, and sharpen the chain.
  • Annually: Replace the spark plug, clean or rebuild the carburetor, and inspect the fuel lines.

• DIY vs. Professional Maintenance: Consider performing some maintenance tasks yourself to save money. However, for more complex tasks like carburetor cleaning or engine repairs, it’s best to seek professional help.

The Importance of Proper Fuel and Oil Mix

Using the correct fuel and oil mix is absolutely critical for the health of your two-stroke chainsaw engine. Stihl chainsaws typically require a 50:1 fuel-to-oil ratio.

• Consequences of Incorrect Mix:

  • Too Little Oil: Can lead to inadequate lubrication, causing premature engine wear and potential seizure.
  • Too Much Oil: Can result in excessive smoking, carbon buildup, and reduced performance.

• Using Pre-Mixed Fuel: Pre-mixed fuel is a convenient option, especially for occasional users. However, it’s generally more expensive than mixing your own fuel.

  • Cost Comparison: Pre-mixed fuel typically costs between $5 and $10 per quart, while mixing your own fuel costs around $2-$4 per quart.

• My Recommendation: I prefer to mix my own fuel using high-quality two-stroke oil and fresh gasoline. This allows me to control the quality of the mixture and save money in the long run.

Understanding Wood Species and Their Impact on Chainsaw Wear

The type of wood you’re cutting can significantly impact the wear and tear on your chainsaw, including the choke.

• Hardwoods vs. Softwoods: Hardwoods like oak, maple, and hickory are denser and more abrasive than softwoods like pine, fir, and cedar. Cutting hardwoods requires more power and can cause the chain to dull more quickly.

• Dirty Wood: Cutting dirty or sandy wood can accelerate wear on the chain, bar, and carburetor.

• Cost Considerations:

  • Chain Sharpening: Cutting hardwoods requires more frequent chain sharpening, which can add to your maintenance costs.
  • Chain Replacement: Chains will need to be replaced more often when cutting abrasive wood.

• My Strategy: When cutting hardwoods, I always use a sharp chain, keep the chain tension properly adjusted, and clean the saw frequently to remove sawdust and debris.

Chainsaw Safety: A Paramount Consideration

Operating a chainsaw can be dangerous, so it’s essential to prioritize safety at all times.

• Personal Protective Equipment (PPE): Always wear appropriate PPE, including:

  • Eye Protection: Safety glasses or a face shield to protect your eyes from flying debris.
  • Hearing Protection: Earplugs or earmuffs to protect your hearing from the loud noise of the chainsaw.
  • Gloves: Heavy-duty gloves to protect your hands.
  • Chaps: Chainsaw chaps to protect your legs from accidental cuts.
  • Boots: Steel-toed boots to protect your feet.

• Safe Operating Practices:

  • Read the Owner’s Manual: Familiarize yourself with the chainsaw’s operating instructions and safety precautions.
  • Maintain a Safe Distance: Keep bystanders and pets away from the work area.
  • Avoid Cutting Overhead: Cutting overhead can be dangerous and should be avoided whenever possible.
  • Be Aware of Kickback: Kickback is a sudden, uncontrolled movement of the chainsaw that can cause serious injury. Be aware of the risk of kickback and take steps to prevent it.

• First Aid Kit: Keep a well-stocked first aid kit readily available in case of an accident.

Chainsaw Chain Sharpening: A Key Skill

A sharp chainsaw chain is essential for efficient cutting and safe operation.

• Signs of a Dull Chain:

  • Difficulty Cutting: The chainsaw struggles to cut through the wood.
  • Excessive Sawdust: The chainsaw produces fine sawdust instead of chips.
  • Pulling to One Side: The chainsaw pulls to one side while cutting.

• Sharpening Techniques:

  • Hand Sharpening: Using a file and guide to sharpen each tooth individually.
  • Electric Sharpening: Using an electric sharpener to sharpen the entire chain quickly and easily.

• Cost Considerations:

  • File and Guide: A file and guide typically cost between $20 and $40.
  • Electric Sharpener: An electric sharpener can cost between $50 and $200.
  • Professional Sharpening: Professional chain sharpening typically costs between $10 and $20 per chain.

• My Approach: I prefer to sharpen my chains by hand using a file and guide. This allows me to maintain a consistent cutting angle and prolong the life of the chain.

Chainsaw Bar Maintenance

The chainsaw bar is another critical component that requires regular maintenance.

• Bar Cleaning: Clean the bar regularly to remove sawdust and debris.

• Bar Dressing: Use a bar dressing tool to remove burrs and flatten the bar rails.

• Bar Lubrication: Ensure the bar is properly lubricated to reduce friction and wear.

• Bar Replacement: Replace the bar when it becomes worn or damaged.

  • Cost of Bar Replacement: A new chainsaw bar typically costs between $30 and $100, depending on the size and quality.

Chainsaw Storage: Protecting Your Investment

Proper storage is essential for protecting your chainsaw when it’s not in use.

• Cleaning: Clean the chainsaw thoroughly before storing it.

• Draining Fuel: Drain the fuel tank to prevent fuel from degrading and clogging the carburetor.

• Storing in a Dry Place: Store the chainsaw in a dry, well-ventilated place to prevent rust and corrosion.

• Using a Chainsaw Case: Use a chainsaw case to protect the chainsaw from dust, dirt, and damage.

The Long-Term Cost of Chainsaw Ownership

Owning a chainsaw involves more than just the initial purchase price. It’s important to consider the long-term costs of ownership, including:

• Fuel and Oil: The cost of fuel and oil can add up over time, especially if you use the chainsaw frequently.

• Maintenance and Repairs: Regular maintenance and occasional repairs are necessary to keep the chainsaw in good working order.

• Replacement Parts: Chains, bars, spark plugs, and air filters will need to be replaced periodically.

• Depreciation: The value of the chainsaw will depreciate over time.

• Total Cost of Ownership: To accurately assess the cost of owning a chainsaw, consider all of these factors over the expected lifespan of the tool.

Exploring Alternative Wood Processing Methods

While chainsaws are essential tools for many wood processing and firewood preparation tasks, it’s worth exploring alternative methods that may be more cost-effective or environmentally friendly in certain situations.

• Hand Tools: Axes, saws, and splitting mauls can be used for felling trees, bucking logs, and splitting firewood. Hand tools require more physical effort but are quieter, cleaner, and less expensive to operate than chainsaws.

• Electric Chainsaws: Electric chainsaws are quieter and cleaner than gasoline-powered chainsaws, but they may not be as powerful.

• Cordless Chainsaws: Cordless chainsaws offer the convenience of electric power without the need for a power cord. However, they typically have a shorter run time than corded electric chainsaws.

• Wood Splitters: Wood splitters can be used to split firewood quickly and efficiently. They are available in both manual and powered models.

Case Study: Budgeting for a Cord of Firewood

Let’s consider a case study to illustrate the costs involved in preparing a cord of firewood.

• Assumptions:

  • You own a Stihl chainsaw and basic wood processing tools.
  • You have access to free or low-cost firewood logs.
  • You plan to process the firewood yourself.

• Cost Breakdown:

  • Fuel and Oil: $20
  • Chain Sharpening: $10
  • Tool Maintenance: $5
  • Labor (Your Time): 8 hours at $15/hour = $120 (Opportunity Cost)

• Total Cost: $155

• Market Value: A cord of firewood typically sells for between $200 and $400, depending on the region and wood species.

• Profit Margin: In this scenario, you could potentially earn a profit of $45 to $245 per cord, depending on the selling price. However, it’s important to factor in the value of your time and effort.

Actionable Takeaways and Next Steps

Understanding your Stihl chainsaw’s choke and mastering its use is a key step toward efficient and cost-effective wood processing and firewood preparation. Here are some actionable takeaways and next steps:

• Study Your Owner’s Manual: Familiarize yourself with the specific choke system on your Stihl chainsaw.
• Practice Proper Choke Technique: Experiment with the choke to find the optimal setting for starting your chainsaw in different conditions.
• Maintain Your Chainsaw Regularly: Clean the air filter, inspect the spark plug, and use fresh fuel.
• Budget for Maintenance: Set aside funds for regular maintenance and repairs.
• Prioritize Safety: Always wear appropriate PPE and follow safe operating practices.

By following these tips, you can ensure your Stihl chainsaw starts easily, runs smoothly, and lasts for years to come, saving you time, money, and frustration. Now, go out there and make some sawdust!

Learn more