Hedge trimmer won’t start or has no power? Check the spark plug
If your Husqvarna hedge trimmer is hard to start, loses power or runs unevenly, the spark plug may be dirty or worn.
The spark plug is responsible for igniting the fuel air mixture in the engine.
Quick answer
Check the spark plug if your hedge trimmer:
- Is difficult to start
- Runs unevenly at idle
- Has low power
Cleaning the spark plug often restores performance.
Safety first
Before starting:
- Wear protective gloves
- Disconnect power (battery, or spark plug wire)
- Allow engine to cool
What you need
- Wire brush
- Combi spanner or spark plug tool
- Replacement spark plug (if needed)
Step-by-step: clean the spark plug
Learn how to clean the spark plug
Learn how to clean the spark plug
Access the spark plug
- Remove the cover.
- Disconnect the cap and wire
Clean around the area
- Remove dirt and debris before removing the spark plug
This prevents contamination inside the engine.
Remove the spark plug
- Use a spanner
- Turn counterclockwise
Inspect the spark plug
Check for:
- Carbon buildup
- Damage or cracks
- Worn electrode
If damaged, replace the spark plug.
Clean the spark plug
- Use a wire brush to remove carbon deposits
A clean electrode improves ignition and performance.
Reinstall the spark plug
- Tighten securely (do not overtighten)
- Reconnect the cap
Test the hedge trimmer
- Start the trimmer
- Check for improved performance
When to replace instead of clean
Replace the spark plug if:
- It is cracked or damaged
- Cleaning does not improve performance
- It is heavily worn
Regular replacement helps maintain engine efficiency.
How often should you check it?
- At the start of the season
- When experiencing performance issues
- As part of regular maintenance
Regular inspection helps prevent starting problems.
Related guides
Why does my hedge trimmer start and then die?
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