Husqvarna Outdoor Power Equipment Chainsaw Won't Start: How to Fix It Yourself
Husqvarna chainsaws are two-stroke engines with the same three requirements: spark, fuel, and air. Old fuel is the number one cause of a no-start. However, chainsaws are also commonly flooded by pulling too many times on full choke without switching to the run position after the first pop.
⚠️ Safety First
- Always wear gloves when handling the chain — it is razor-sharp even when not spinning.
- Keep the chain brake engaged when starting the saw.
- Work outdoors only — chainsaws produce dangerous exhaust fumes.
- Use the proper 50:1 fuel mix. Running straight gas destroys the engine permanently.
- Never start a chainsaw while holding it in the air.
Parts You May Need
Step-by-Step Repair
- 1
Use the correct starting sequence
Engage the chain brake. Set the choke to full (cold start). Turn on the ignition switch. Press the fuel primer (decompression valve on some models) if equipped. Pull the starter cord until you hear the engine try to fire (a brief pop). Immediately move the choke to the half-open position and pull again. It should start within 1-3 more pulls. Leaving the choke on full after the first pop floods the engine.
- 2
Clear a flooded engine
If you smell strong fuel, the engine is flooded. Move the choke to the run (open) position, hold the throttle trigger wide open, and pull the starter cord 10-15 times. This pumps fresh air through the engine to clear excess fuel. Then try the normal starting procedure again. For severely flooded engines, remove the spark plug and pull the cord several times to blow out the excess fuel.
- 3
Drain and replace the fuel
Pour out old fuel and replace with a fresh 50:1 mix of premium unleaded gas and quality two-stroke oil. Husqvarna recommends their own brand oil, but any good-quality two-stroke oil works fine. Press the primer bulb until you see fuel flowing through the return line. Old gas with ethanol is especially destructive in chainsaw carburetors.
- 4
Replace the spark plug
Remove the top cover and unscrew the spark plug. Check the gap (typically 0.020 inches for Husqvarna) and replace it if the electrode is worn, fouled, or cracked. When you have the plug out, pull the starter cord while holding the plug against the metal engine body — you should see a strong blue spark. No spark means the ignition coil may be failing.
- 5
Clean the air filter
Remove the top cover and pull out the air filter. Chainsaws suck in sawdust constantly, so the filter clogs quickly. Tap out loose debris, brush it clean, or wash with warm soapy water and let it dry completely. A clogged air filter makes the fuel mixture too rich and is a very common reason the saw bogs down or will not start.
If That Didn't Work
- Clogged spark arrestor screen in the muffler
- Broken or cracked fuel lines (very common on older saws)
- Faulty ignition coil (no spark)
- Compression loss from worn piston rings
When to Call a Professional
If you have no spark with a new plug, if the starter rope does not have resistance (indicating a compression problem), or if the carburetor needs rebuilding, a Husqvarna dealer or small engine shop can handle these repairs. Chainsaws are powerful tools, and internal engine work is best left to experienced mechanics.
Related Repairs
Disclaimer: This guide is for informational and educational purposes only and does not constitute professional repair advice. All repairs are performed at your own risk. RepairItFree.com is not liable for any personal injury, property damage, device damage, voided warranties, or other losses resulting from the use of this information.
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