July 14, 2025

Help! My Chainsaw Won’t Start!

 

A chainsaw is a powerful tool used for cutting down trees, trimming branches, and preparing firewood. While it's incredibly useful, it can sometimes be frustrating when it fails to start or runs improperly. If your chainsaw isn't working as expected, there are several common issues that could be causing the problem.

Whether you're dealing with a gas or electric model, there are various reasons why your chainsaw might not start. Before you begin any troubleshooting, always prioritize safety. Make sure the area is clear, avoid wearing loose clothing, and keep the saw pointed away from people or structures. Always assume the machine could start at any moment.

Here are some of the most common causes of a chainsaw not starting and how to fix them:

My Chainsaw Won’t Start? What Could Be the Problem?

The Carburetor Needs Cleaning

The carburetor mixes air and fuel to create the proper mixture for combustion. Over time, especially if the chainsaw sits unused for long periods, gasoline can degrade and form varnish or gum, which clogs the small passages in the carburetor. This can prevent the engine from starting properly. To fix this, drain the fuel tank, spray the carburetor with a specialized cleaner, and wipe it clean. If the issue persists, consider replacing the carburetor.

The Carburetor May Need Replacement

If cleaning doesn't solve the issue, the carburetor may be too damaged to repair. Try pouring a small amount of fresh fuel into the air filter and pulling the starter rope. If the engine starts briefly and then dies, the carburetor is likely the culprit. Replace it with a compatible model from the manufacturer to restore proper function.

Spark Plug Issues

A spark plug can last for years if maintained properly, but over time, it can accumulate deposits or become worn out. Check the spark plug by removing it and inspecting the electrode. Clean it with fine sandpaper and check the gap against the manufacturer’s specifications. If it’s dirty, broken, or hasn’t been replaced in a while, replace it with a new one.

Defective Recoil Starter

If the recoil starter is damaged or not assembled correctly, the chainsaw won’t start. Remove the starter assembly and check for any obstructions or misalignment. If the pulley system is stuck, realign it. If the problem continues, the recoil starter may need to be replaced entirely.

Broken Rewind Spring

The rewind spring helps pull the starter cord back after each use. If the cord doesn’t rewind properly, the spring is likely damaged. In such cases, the rewind spring should be replaced. Depending on the model, you may be able to replace just the spring or the entire recoil starter assembly.

Clogged Fuel Filter

A clogged fuel filter can prevent fuel from reaching the engine. This often happens due to dirt, sawdust, or degraded fuel. Always clean the fuel tank cap before refilling and ensure the fuel is fresh. If the filter is blocked, replace it to restore fuel flow.

Clogged Air Filter

A clogged air filter restricts airflow, making it impossible for the engine to run. Remove the air filter and clean it with compressed air or gently tap it on a hard surface to remove debris. If the filter is damaged or excessively worn, replace it immediately. A clean air filter is essential for the longevity of your chainsaw.

Flooded Engine

If the chainsaw smells strongly of gasoline, it may be flooded. This usually happens when you attempt to start the engine multiple times without success. To fix this, pull the starter cord several times while holding the throttle to clear excess fuel. Dry the spark plug and replace it if necessary. Then try starting the chainsaw again.

Get Quality Replacement Parts at Jono & Johno

If your Stihl or Husqvarna chainsaw isn’t starting, many of these issues can be resolved with simple maintenance or part replacements. However, it’s crucial to use high-quality parts to ensure reliability and performance. At Jono & Johno, we offer a wide range of genuine replacement parts for Stihl, Husqvarna, and other leading brands. Our products are designed to meet the highest standards, ensuring your chainsaw runs smoothly for years to come.

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