Chainsaw pull cord very hard to pull

Symptoms

• Pull cord requires much more force than usual
• Resistance feels like hitting a solid wall partway through the pull
• Saw has a decompression button that isn't being used
• Cord was easy to pull before recent fueling or storage

Likely causes

• CommonNot using the decompression valveMany chainsaws have a small button that releases cylinder pressure before starting; skipping it makes pulling much harder.
• CommonFlooded engine with fuel in the cylinderExcess fuel can create hydraulic lock resistance against the piston.
• PossibleNormal high compression on a healthy engineSome saws simply have firm compression by design, especially professional models.
• PossibleSeized or damaged starter pawl mechanismA binding pawl can create resistance unrelated to engine compression.
• Less commonInternal engine damageRare cases of piston or cylinder damage can create abnormal resistance.

What to do

1. Check if your saw has a decompression button (often near the top of the cylinder) and press it before pulling.
2. If recently fueled or primed excessively, remove the spark plug and pull the cord a few times to clear a flooded cylinder.
3. Dry the spark plug and reinstall it once excess fuel has cleared.
4. Confirm you're pulling with a full, smooth motion rather than short jerky pulls, which can feel harder than they need to be.
5. Inspect the starter pawl and recoil mechanism for binding if resistance feels mechanical rather than compression-related.
6. Compare the resistance to when the saw was new or freshly serviced, since some models are simply firmer by design.
7. If pulling remains abnormally hard with no flooding and a working decompression valve, have a small-engine shop check for internal engine issues.

Tools and parts

• Spark plug wrench

When to call a pro

If the cord remains extremely hard to pull after clearing flooding and using the decompression valve, have a small-engine mechanic check compression and internal components.

Safety