How To Start Stihl Chainsaw: Troubleshooting Common Issues

Do you want to know how to start a Stihl chainsaw? A Stihl chainsaw is started by following a specific procedure involving the choke, throttle, and pull cord. If your chainsaw won’t start, it’s often due to issues like flooding, incorrect fuel mixture, or problems with the spark plug. This comprehensive guide covers everything you need to know about starting your Stihl chainsaw and troubleshooting common problems.

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The Complete Stihl Chainsaw Starting Guide

Starting a chainsaw can be tricky, especially if you’re new to using one. This guide breaks down the process into easy-to-follow steps, covering both cold and warm starts.

Starting a Cold Stihl Chainsaw: A Step-by-Step Approach

Starting a cold Stihl chainsaw requires a specific process to get the engine running. Here’s how to do it:

1. Safety First: Always wear appropriate safety gear, including gloves, eye protection, and hearing protection. Place the chainsaw on a stable, flat surface. Make sure the chain brake is engaged. This prevents the chain from moving during the starting process.
2. Fuel Check: Ensure the fuel tank has the correct Stihl chainsaw fuel mixture. This is typically a mix of gasoline and 2-cycle engine oil.
3. Choke Engagement: Locate the choke lever. For a cold start, move the choke lever to the “full choke” position. This enriches the fuel mixture to help the engine start.
4. Priming the Chainsaw: If your chainsaw has a primer bulb, press it several times (usually 5-8 times) until you see fuel entering the bulb. Priming helps draw fuel into the carburetor.
5. Starting Position: Place your foot firmly on the rear handle to stabilize the chainsaw. Grip the starter handle firmly with one hand.
6. Pulling the Cord: Pull the starter cord with a quick, firm motion. Do not pull the cord all the way out, and let it retract slowly to avoid damage. Repeat this until the engine attempts to start or “pops”. It may take several pulls.
7. Choke Adjustment: Once the engine pops, move the choke lever to the “half choke” position. This leans out the fuel mixture slightly.
8. Final Start: Pull the starter cord again until the engine starts and runs smoothly.
9. Warm-Up: Allow the engine to warm up for a few seconds before disengaging the chain brake and beginning to cut.

Starting a Warm Stihl Chainsaw: A Simplified Method

Starting a warm Stihl chainsaw is generally easier than starting a cold one. Here’s the process:

1. Safety Check: As always, wear your safety gear and ensure the chain brake is engaged.
2. Choke Position: For a warm start, the choke lever should typically be in the “off” or “run” position.
3. Throttle Lock (If Applicable): Some models have a throttle lock. If yours does, engage the throttle lock and slightly depress the throttle trigger.
4. Pulling the Cord: Pull the starter cord with a quick, firm motion until the engine starts.
5. Throttle Release: Once the engine starts, release the throttle lock and allow the engine to idle.
6. Ready to Work: Disengage the chain brake and begin cutting.

Chainsaw Won’t Start: Common Problems and Solutions

Even with the right starting procedure, your Stihl chainsaw might refuse to start. Here are some common reasons and how to fix them:

Fuel-Related Issues

Fuel problems are a frequent cause of starting difficulties.

• Old or Stale Fuel: Fuel can degrade over time, especially if it contains ethanol.
  • Solution: Drain the old fuel and replace it with fresh fuel mixed with the correct amount of 2-cycle engine oil.
• Incorrect Fuel Mixture: Using the wrong fuel mixture can prevent the engine from starting.
  • Solution: Always use the fuel mixture ratio recommended by Stihl (usually 50:1). Use a fuel stabilizer to prolong the life of the fuel mixture.
• Stihl Chainsaw Flooding: Over-priming or repeated starting attempts with the choke on can flood the engine.
  • Solution: Remove the spark plug and pull the starter cord several times to clear excess fuel from the cylinder. Let the cylinder air out for a few minutes before replacing the spark plug and trying to start the engine again.

Ignition System Problems

The ignition system is crucial for starting the engine.

• Faulty Spark Plug: A dirty, damaged, or improperly gapped spark plug can prevent the engine from firing.
  • Solution: Inspect the spark plug. Clean it with a wire brush if it’s dirty. If it’s damaged or worn, replace it. Ensure the spark plug gap is correct.
  • The recommended spark plug gap for most Stihl chainsaws is usually between 0.5mm and 0.8mm (0.020 to 0.031 inches).
• Ignition Coil Issues: A faulty ignition coil can prevent the spark plug from receiving the necessary voltage.
  • Solution: Test the ignition coil with a multimeter. If it’s not functioning properly, replace it. This is usually a job for a qualified technician.

Air Intake and Exhaust Issues

Proper airflow is essential for engine operation.

• Clogged Air Filter: A dirty air filter restricts airflow to the engine, making it difficult to start.
  • Solution: Remove the air filter and clean it with soap and water. Allow it to dry completely before reinstalling it. Replace the air filter if it’s heavily soiled or damaged.
• Obstructed Exhaust Port: A clogged exhaust port can prevent the engine from expelling exhaust gases, hindering starting.
  • Solution: Inspect the exhaust port for carbon buildup. Clean it with a wire brush or a specialized exhaust port cleaning tool.

Other Potential Issues

These problems may also affect starting.

• Chain Brake Engaged: The chain brake must be disengaged to start the chainsaw.
  • Solution: Ensure the chain brake is fully disengaged before attempting to start the chainsaw.
• Stihl Chainsaw Pull Cord Problems: A broken or jammed pull cord can prevent you from starting the engine.
  • Solution: Inspect the pull cord for damage. If it’s broken, replace it. If it’s jammed, try to unjam it carefully. You may need to disassemble the starter assembly to address the problem.
• Carburetor Problems: A dirty or malfunctioning carburetor can cause starting issues.
  • Solution: Clean the carburetor with carburetor cleaner. If the carburetor is severely damaged or clogged, it may need to be rebuilt or replaced.
• Compression Issues: Low compression can make the engine difficult or impossible to start.
  • Solution: Test the engine compression with a compression tester. If the compression is low, it could indicate worn piston rings, a damaged cylinder, or a leaking valve. This usually requires professional repair.

Chainsaw Troubleshooting: A Detailed Guide

Here’s a table summarizing common starting problems and their solutions:

Problem	Possible Cause	Solution
Chainsaw won’t start	Old or stale fuel	Drain old fuel, replace with fresh fuel and correct oil mixture.
	Incorrect fuel mixture	Use the correct fuel mixture ratio (usually 50:1).
	Flooded engine	Remove spark plug, pull starter cord to clear excess fuel, let cylinder air out, replace spark plug.
	Faulty spark plug	Inspect, clean, gap, or replace the spark plug.
	Clogged air filter	Clean or replace the air filter.
	Obstructed exhaust port	Clean the exhaust port.
	Chain brake engaged	Disengage the chain brake.
	Pull cord problems	Inspect and repair or replace the pull cord.
	Carburetor problems	Clean or rebuild the carburetor.
	Low compression	Test compression; if low, seek professional repair.
Chainsaw starts then stalls	Incorrect choke position	Adjust choke position.
	Dirty fuel filter	Replace fuel filter.
	Carburetor adjustment needed	Adjust carburetor settings.
Chainsaw hard to start	Weak spark	Check and replace spark plug, inspect ignition coil.
	Low compression	Test compression; if low, seek professional repair.
	Partially clogged fuel line	Clean or replace fuel line.

Maintaining Your Stihl Chainsaw for Easy Starting

Regular maintenance is key to ensuring your Stihl chainsaw starts easily and runs reliably. Here are some essential maintenance tips:

• Clean the Air Filter Regularly: A clean air filter ensures proper airflow to the engine. Clean it after every few uses.
• Inspect and Clean the Spark Plug: Check the spark plug regularly and clean or replace it as needed.
• Use Fresh Fuel: Always use fresh fuel mixed with the correct amount of 2-cycle engine oil.
• Sharpen the Chain: A sharp chain reduces strain on the engine and makes cutting easier.
• Check and Adjust Chain Tension: Proper chain tension is essential for safe and efficient operation.
• Lubricate the Chain: Keep the chain lubricated with chain oil to reduce friction and wear.
• Clean the Bar and Sprocket: Remove debris from the bar and sprocket to ensure smooth chain movement.
• Store the Chainsaw Properly: Store the chainsaw in a dry place with the fuel tank empty or treated with fuel stabilizer.
• Service the Chainsaw Regularly: Have your chainsaw serviced by a qualified technician at least once a year.

Deciphering the Stihl Chainsaw Choke Position

The choke lever plays a crucial role in starting your Stihl chainsaw. It controls the amount of air entering the carburetor, which affects the fuel-air mixture. The correct choke position depends on whether the engine is cold or warm.

• Full Choke: Used for starting a cold engine. It restricts airflow, creating a richer fuel mixture.
• Half Choke: Used after the engine has “popped” or attempted to start. It allows more air into the mixture.
• Off/Run: Used for normal operation and for starting a warm engine. The choke is fully open, allowing maximum airflow.

Fathoming the Stihl Chainsaw Fuel Mixture

The Stihl chainsaw fuel mixture is a critical factor in engine performance and longevity. Using the wrong mixture can lead to engine damage and starting problems.

• Correct Ratio: Stihl typically recommends a fuel mixture ratio of 50:1. This means 50 parts gasoline to 1 part 2-cycle engine oil.
• Types of Oil: Use a high-quality 2-cycle engine oil specifically designed for air-cooled engines. Stihl Ultra oil is a popular choice.
• Mixing Fuel: Mix the fuel and oil in a clean fuel container. Shake the container thoroughly to ensure the mixture is properly blended.
• Fuel Stabilizer: Add a fuel stabilizer to the mixture to prevent the fuel from degrading over time.

FAQ: Frequently Asked Questions

• What is the best fuel mixture for a Stihl chainsaw?
  • The best fuel mixture for a Stihl chainsaw is typically 50:1 (50 parts gasoline to 1 part 2-cycle engine oil). Always refer to your chainsaw’s manual for specific recommendations.
• Can I use regular gasoline in my Stihl chainsaw?
  • Yes, you can use regular unleaded gasoline with a minimum octane rating of 89. However, it’s essential to mix it with the correct amount of 2-cycle engine oil.
• Who is responsible for repairing my Stihl chainsaw under warranty?
  • An authorized Stihl dealer is responsible for repairing your chainsaw under warranty. Contact your local dealer for assistance.
• What happens if I use the wrong fuel mixture in my Stihl chainsaw?
  • Using the wrong fuel mixture can cause engine damage, including piston scoring, cylinder damage, and premature wear. It can also lead to starting problems and reduced performance.
• What should I do if my Stihl chainsaw floods?
  • If your Stihl chainsaw floods, remove the spark plug and pull the starter cord several times to clear excess fuel from the cylinder. Let the cylinder air out for a few minutes before replacing the spark plug and trying to start the engine again.
• How often should I replace the spark plug on my Stihl chainsaw?
  • You should replace the spark plug on your Stihl chainsaw at least once a year or after every 100 hours of use, whichever comes first.
• Why is my Stihl chainsaw pull cord hard to pull?
  • A hard-to-pull pull cord can be caused by several factors, including low compression, a seized engine, or a malfunctioning starter mechanism. If the pull cord is consistently difficult to pull, have your chainsaw inspected by a qualified technician.

By following this comprehensive guide, you’ll be well-equipped to start your Stihl chainsaw and troubleshoot common starting problems. Remember to always prioritize safety and perform regular maintenance to keep your chainsaw running smoothly for years to come.