Understanding how to start a chainsaw safely is the foundation of every cutting job, and doing it correctly protects you from the most common causes of injury. A chainsaw is a powerful tool, but starting it is simple and safe when you follow a consistent routine: gear up, engage the chain brake, set the choke, and start on solid ground. This guide covers cold and warm starts, the protective equipment you need, and the mistakes to avoid so you can fire up your saw with confidence every time.
Gear Up First: Personal Protective Equipment
Before you even pick up the saw, put on the right protective gear. A chainsaw can cause severe injury in a fraction of a second, and OSHA lists proper protective equipment as one of the most important defenses against injury. Do not start a saw without it:
- A helmet with a face shield or safety glasses
- Hearing protection such as earmuffs or plugs
- Cut-resistant chaps or trousers
- Sturdy, non-slip boots – ideally with steel toes
- Heavy-duty gloves for grip and protection
- Close-fitting clothing with no loose ends
Pre-Start Checklist
A quick inspection prevents both starting problems and accidents. Take a moment to confirm the saw is ready and your surroundings are clear before you begin. Check the fuel and bar-oil levels, make sure the chain is properly tensioned, and confirm there are no people, pets, or obstacles within reach of the saw. A well-maintained saw with a correctly tensioned chain is far easier and safer to start.
How to Start a Chainsaw Step by Step
The following sequence works for most gas chainsaws from a cold start. Always keep the chain brake engaged until you are ready to cut.
- Engage the chain brake. Push the brake handle forward so the chain is locked and cannot spin when the engine fires. Do this every single time.
- Turn on the ignition switch. Set the on/off switch to the on or run position.
- Set the choke to full. For a cold engine, pull the choke out to its full position to enrich the fuel mixture.
- Press the primer bulb. If your saw has one, push the primer several times to draw fuel into the carburetor.
- Place the saw on the ground. Set it on flat, clear ground. Put the toe of your right boot through the rear handle and grip the top handle firmly with your left hand.
- Pull the starter cord. Pull the cord in a smooth, firm motion until the engine coughs or briefly fires. Do not yank it to the very end of its travel.
- Move the choke to half. Once the engine has coughed, push the choke halfway in and pull the cord again until the engine starts and idles.
- Let it warm up, then release the brake. Squeeze the throttle briefly to clear the choke, let the saw idle for a moment, then disengage the chain brake only when you are ready to cut.
Warm Starts and the In-Leg Method
Restarting a warm saw is simpler because you usually skip the choke entirely. Engage the chain brake, leave the choke off, and pull the cord to start. If you need to start the saw away from the ground, you can brace it securely between your knees, clamping the rear handle between your thighs with the chain brake on. Never drop-start a saw by swinging it through the air, which is a leading cause of loss of control.
Common Problems and Fixes
The saw floods and won’t start
Too much choke or too many cord pulls can flood the engine with fuel. Move the choke off, hold the throttle open, and pull the cord several times to clear it – or simply let the saw sit for 15 minutes before trying again.
The engine fires then dies
This often means you left the choke on full too long or the fuel is stale. Move the choke to half or off, and refill with a fresh fuel-and-oil mix if the gas is old.
No spark or no start at all
Check that the ignition switch is on, the tank has the correct fuel mix, and the spark plug is clean and connected. A fouled plug is a frequent, inexpensive cause of no-starts.
Best Chainsaws for Home Use
Reliable starting begins with a well-built saw. Compare our recommendations in the best chainsaws for home use, best gas chainsaw, and best DeWalt battery chainsaw guides.
Frequently Asked Questions
How do you start a cold chainsaw?
For a cold start, engage the chain brake, set the choke to full, press the primer bulb, and turn on the ignition. Place the saw on the ground, hold it firmly, and pull the starter cord until the engine coughs. Then move the choke to half and pull again until it runs.
Should the chain brake be on when starting a chainsaw?
Yes, always. Engage the chain brake before every start. It locks the chain so it cannot spin when the engine fires, which is a critical safety step whether you start on the ground or between your legs.
Can you start a chainsaw in the air?
Drop-starting a chainsaw by swinging it in the air is unsafe and discouraged by manufacturers and safety agencies. Always start it on the ground or braced securely between your knees so you keep full control of the saw.
Why won’t my chainsaw start?
Common causes are a flooded engine from too much choke, stale fuel, a fouled spark plug, or an empty tank. Let a flooded saw sit, check for fresh fuel, and inspect the spark plug. Also confirm the ignition switch is on and the tank is filled with the correct fuel mix.
What safety gear do I need to operate a chainsaw?
At minimum, wear a helmet with face and eye protection, hearing protection, cut-resistant chaps or trousers, sturdy boots, and gloves. OSHA lists this protective equipment as essential for reducing the severity of chainsaw injuries.
Final Thoughts
Once you know how to start a chainsaw safely, the routine becomes second nature: gear up, engage the brake, set the choke, and start on the ground. Never rush it, and never skip your protective equipment. For a complete overview of safe operation and required gear, see OSHA’s guide to working safely with chainsaws. Keep your saw performing at its best with our guides on how to sharpen a chainsaw chain and how to tension a chainsaw chain, and browse more in our how-to guides.