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Petrol-powered Hedge Trimmer support
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
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?