The Correct Method for Starting Your Stihl Saw
To correctly start your Stihl saw, ensure it is on a stable, flat surface with the chain brake engaged. Set the choke to the cold start position, then press the primer bulb until fuel is visible. Depress the throttle lock and pull the starter rope firmly until the engine attempts to fire. Move the choke to the half-start position and pull the rope again until the engine runs. Disengage the chain brake once the engine is running steadily. Always consult your specific model's manual for precise instructions, as variations exist.
- Engage chain brake before starting.
- Use primer bulb and choke correctly for cold starts.
- Hold throttle lock while pulling starter rope.
- Move choke to half-start after initial firing.
- Disengage brake only when engine is running.
Many Stihl models feature an Easy2Start system, which employs a spring-loaded mechanism to reduce the effort required for starting. If your saw is equipped with this, you'll simply pull the starter cord gently until resistance is felt, then give it a short, sharp pull. Regardless of the system, proper preparation is key to a successful start and safe operation. Understanding the sequence prevents frustration and potential damage.
The choke lever dictates the fuel-air mixture for starting. In cold conditions, the 'cold start' or 'full choke' position enriches the mixture by restricting air, aiding ignition. Once the engine sputters or attempts to run, the choke is moved to 'half-start' or 'warm start' to lean the mixture slightly, allowing the engine to stabilise. If the engine floods (too much fuel), you may need to switch the choke to the 'off' or 'run' position and try again, potentially with the throttle slightly open.
For models without Easy2Start, a consistent, firm pull on the starter cord is more effective than short, jerky movements. Maintain a good grip on the saw's front handle to keep it stable. A common error is not pulling the rope far enough, or pulling it too erratically, which can prevent the engine from catching or even cause premature wear on the starter mechanism.
Safety is paramount; never attempt to start a Stihl saw while holding it between your legs or in any unsecured position. Always ensure you have ample space and are not near flammable materials. The chain brake is a critical safety feature designed to stop the chain's rotation immediately, and it must be engaged whenever you are preparing to start or have just finished running the engine.
Common Mistakes When Starting a Stihl Saw
Why do Stihl saws sometimes refuse to start, or start with difficulty? Often, it's down to one of several common user errors. The most prevalent mistake involves incorrect use of the choke and primer bulb. If the engine is cold, failing to engage the full choke or skipping the primer bulb can mean it simply doesn't get enough fuel to ignite. Conversely, leaving the choke on full for too long after the engine has fired can lead to flooding, where excess fuel prevents ignition.
Another frequent oversight is not engaging the throttle lock when pulling the starter cord. On many Stihl models, this lock is essential for pulling the cord with the correct throttle position engaged, which is necessary for starting. Without it, the engine might not receive the correct fuel-air mix required to fire up. Users might also forget to ensure the chain brake is engaged, which is a crucial safety step that can, in some designs, also affect the starting sequence.
Failure to maintain the saw is a significant factor. A clogged air filter restricts airflow, making it difficult for the engine to breathe and start. Old or contaminated fuel is another culprit; petrol degrades over time, and stale fuel can cause starting issues and poor performance. Using the incorrect fuel-to-oil ratio in a 2-stroke engine will also lead to problems, from difficult starting to engine damage.
Finally, physically incorrect starting technique can be an issue. Pulling the starter rope too gently, or in short, jerky motions, may not engage the starter mechanism fully or provide enough momentum for ignition. Some users might also pull the rope while the saw is not on a firm, level surface, leading to instability and an awkward pull that is less effective.
Ensure your fuel is fresh and correctly mixed; use a separate, clean container to mix your 2-stroke fuel and oil in the recommended ratio immediately before use, then pour it into the saw's fuel tank.
Why these mistakes occur
These errors often stem from a lack of familiarity with the specific Stihl model or a misunderstanding of how 2-stroke engines operate. The sequence of choke, primer, throttle lock, and pull requires precise timing. Furthermore, the assumption that all chainsaws start identically can lead to overlooking model-specific features like the Easy2Start system or specific choke lever positions. Regular maintenance can also be neglected, leading to issues that appear as starting problems but are actually symptoms of deeper mechanical needs.
A flooded engine is a common consequence of over-choking or incorrect starting sequences, where too much fuel overwhelms the spark plug's ability to ignite it. This is a primary reason why saws might refuse to start after a few attempts. Addressing a flooded engine requires a specific approach to clear the excess fuel.Troubleshooting Common Stihl Saw Starting Problems
If your Stihl saw is not starting, the first step is to identify whether the engine is getting fuel, air, and spark. If you've followed the correct starting procedure and it still won't fire, consider these troubleshooting steps.
Clearing a Flooded Engine
If you suspect the engine is flooded (you smell excessive fuel, or it sputtered and died repeatedly), try this: turn the choke to the 'off' or 'run' position. If your saw has an adjustable throttle, hold the throttle trigger fully open. Now, pull the starter rope firmly several times to clear the excess fuel. Once done, return the choke to the 'half-start' position (if applicable for your model), and attempt to start the engine again using the standard procedure. If it starts, immediately move the choke to the 'run' position once it's running.
Checking Fuel and Air Supply
Verify that you have fresh, correctly mixed fuel in the tank. If the fuel is old (more than a month or two, especially if not stabilised), it's best to drain it and refill with a fresh mix. Inspect the air filter for blockages. If it's dirty, clean or replace it according to your model's manual. A blocked filter can severely impede airflow, preventing the engine from starting or running properly.
Investigating Ignition Issues
A spark plug that is fouled, wet, or damaged will prevent ignition. Remove the spark plug cap and the spark plug itself. Check the plug for signs of damage, excessive carbon build-up, or wetness. If it's wet with fuel, it's likely flooded. Wipe it dry, clean off any carbon deposits (or replace the plug if damaged), ensure the gap is set correctly (refer to your manual), and reinstall it. You can also check for spark by reattaching the spark plug cap to the plug, holding the plug body against a metal part of the engine (ensure you don't touch the plug itself), and pulling the starter rope. You should see a blue spark jump across the electrode. If there's no spark, the issue could be the spark plug, the ignition coil, or a faulty kill switch.
Always disconnect the spark plug wire before performing any maintenance like cleaning or replacing the spark plug. This prevents accidental starting and potential injury. If you are unsure about checking the ignition system, it is best to seek professional assistance.
Maintaining Your Stihl Saw for Reliable Starting
Consistent maintenance is the most effective way to prevent starting issues with your Stihl saw. A well-maintained machine will start reliably every time, saving you time and effort when you need it most.
Regular Cleaning and Checks
Keep your saw clean, especially around the engine's cooling fins, air intake, and carburettor. A clean air filter is crucial for proper engine function; clean or replace it regularly as per the manufacturer's recommendations. Inspect the spark plug periodically for wear and tear, and clean or replace it as needed. Ensure the fuel and oil caps are securely fastened to prevent contamination.
Fuel and Oil Management
Always use fresh, high-quality fuel mixed with the correct Stihl 2-stroke oil in the precise ratio specified in your owner's manual. Stale fuel is a primary cause of starting problems and performance issues. If you don't use your saw frequently, consider using a fuel stabiliser or draining the fuel tank after each use. Ensure the oil reservoir for the chain lubrication is also topped up.
Seasonal Storage
If storing your Stihl saw for an extended period, follow the manufacturer's guidelines for winterisation or long-term storage. This typically involves running the engine until it uses up all the fuel in the tank (to prevent fuel system gumming) or adding a fuel stabiliser and running the engine briefly to circulate it. Store the saw in a clean, dry place, ideally in its original packaging or a protective case.
Periodically check the starter rope for fraying or wear. If it shows any signs of damage, replace it immediately to prevent it from snapping mid-pull.
When to Seek Professional Help
While many starting issues can be resolved with basic maintenance and troubleshooting, some problems may indicate more serious internal engine issues. If you've tried all the standard fixes, such as cleaning the carburettor, replacing the spark plug, and ensuring fresh fuel, but the saw still won't start, it's time to consult a qualified Stihl service centre. They have the specialised tools and expertise to diagnose and repair complex problems, ensuring your saw is returned to optimal working order.
Don't underestimate the importance of the owner's manual. It contains specific information tailored to your exact Stihl model, including detailed maintenance schedules and starting procedures that might differ slightly from general advice. Always refer to it for the most accurate guidance.