Stihl Hedge Trimmer Won’T Rev Up [Easy Troubleshooting]

Is your Stihl hedge trimmer refusing to rev up
causing frustration and inconvenience You’re not alone. Many owners encounter this common issue
which can hinder your trimming tasks. But fear not
as we’re here to guide you through troubleshooting and resolving this problem. Whether you’re a professional landscaper or a homeowner with a green thumb
understanding and addressing this issue is crucial to keeping your hedge trimmer in top working condition. Let’s dive into the troubleshooting process and get your Stihl hedge trimmer revving up again in no time.

Reasons Why Stihl Hedge Trimmer Won’T Rev Up

No Fuel

The most common reason for a Stihl hedge trimmer not to rev up is that there is no fuel in the tank. Check the fuel level and add more fuel if necessary.

Dirty Fuel Filter

A dirty fuel filter can restrict the flow of fuel to the engine, causing it to stall or not rev up. Clean or replace the fuel filter as needed.

Clogged Air Filter

A clogged air filter can restrict the flow of air to the engine, causing it to run lean and stall. Clean or replace the air filter as needed.

Spark Plug Problems

A faulty spark plug can prevent the engine from firing, causing it to not rev up. Check the spark plug and replace it if necessary.

Engine Compression Problems

Low engine compression can prevent the engine from firing, causing it to not rev up. Have the engine compression checked and repaired as needed.

Throttle Cable Problems

A stuck or damaged throttle cable can prevent the engine from revving up. Inspect the throttle cable and replace it if necessary.

Stihl Hedge Trimmer Won’t Rev Up: How to Troubleshoot

Symptoms

There are a few different symptoms that may indicate that your Stihl hedge trimmer won’t rev up. These include:

The engine doesn’t start at all
The engine starts but dies immediately
The engine starts but won’t stay running
The engine runs but doesn’t produce enough power

Causes

There are a number of different things that could cause your Stihl hedge trimmer to not rev up. These include:

A dirty air filter
A clogged fuel filter
A bad spark plug
A faulty carburetor
A loose or damaged spark plug wire
A problem with the governor
A problem with the fuel pump
A problem with the ignition switch

Troubleshooting

To troubleshoot the problem with your Stihl hedge trimmer, you will need to first identify the cause. Here are a few steps to help you do this:

1. Check the air filter. If the air filter is dirty, it can restrict the flow of air to the engine, which can cause it to not start or run properly. To clean the air filter, remove it from the engine and rinse it with warm water. Allow the air filter to dry completely before reinstalling it.
2. Check the fuel filter. If the fuel filter is clogged, it can prevent fuel from reaching the engine, which can also cause it to not start or run properly. To check the fuel filter, remove it from the engine and inspect it for dirt or debris. If the fuel filter is clogged, replace it with a new one.
3. Check the spark plug. If the spark plug is bad, it can cause the engine to not start or run properly. To check the spark plug, remove it from the engine and inspect it for damage. If the spark plug is damaged, replace it with a new one.
4. Check the carburetor. If the carburetor is dirty or malfunctioning, it can cause the engine to not start or run properly. To clean the carburetor, you will need to remove it from the engine and disassemble it. Once the carburetor is disassembled, clean all of the parts with a carburetor cleaner. Reassemble the carburetor and reinstall it on the engine.
5. Check the spark plug wire. If the spark plug wire is loose or damaged, it can cause the engine to not start or run properly. To check the spark plug wire, inspect it for damage. If the spark plug wire is damaged, replace it with a new one.
6. Check the governor. If the governor is malfunctioning, it can cause the engine to not rev up properly. To check the governor, you will need to remove it from the engine and inspect it for damage. If the governor is damaged, replace it with a new one.
7. Check the fuel pump. If the fuel pump is not working properly, it can prevent fuel from reaching the engine, which can cause it to not start or run properly. To check the fuel pump, you will need to remove it from the engine and test it. If the fuel pump is not working properly, replace it with a new one.
8. Check the ignition switch. If the ignition switch is faulty, it can prevent the engine from starting or running properly. To check the ignition switch, inspect it for damage. If the ignition switch is damaged, replace it with a new one.

Solutions

Once you have identified the cause of the problem, you can then fix it. Here are a few solutions to the most common problems that can cause a Stihl hedge trimmer to not rev up:

Dirty air filter:

To clean the air filter, remove it from the engine and rinse it with warm water. Allow the air filter to dry completely before reinstalling it.

Clogged fuel filter:

To check the fuel filter, remove it from the engine and inspect it for dirt or debris. If the fuel filter is clogged, replace it with a new one.

Bad spark plug:

To check the spark plug, remove it from the engine and inspect it for damage. If the spark plug is damaged, replace it with a new one.

Faulty carburetor:

To clean the carburetor, you will need to remove it from the engine and disassemble it. Once the carburetor is disassembled, clean all of the parts with a carburetor cleaner. Reassemble the carburetor and reinstall it on the engine.

Loose or damaged spark plug wire:

To check the spark plug wire, inspect it for damage. If the spark plug wire is damaged, replace it with a new one.

Malfunctioning governor:

To check the governor, you will need to remove it from the engine

Also Read: Black & Decker Hedge Trimmer Repair Stops Working Whenupside Down

FAQs: Stihl Hedge Trimmer Won’t Rev Up

Why won’t my Stihl hedge trimmer rev up?

There are a few possible reasons why your Stihl hedge trimmer won’t rev up. Here are some of the most common:

The spark plug is fouled: This is the most common cause of a hedge trimmer not revving up. A fouled spark plug can prevent the engine from firing properly, which will prevent it from revving up. To check the spark plug, remove it from the engine and inspect it for signs of fouling. If the spark plug is fouled, clean it or replace it with a new one.

The air filter is dirty: A dirty air filter can restrict airflow to the engine, which can also prevent it from revving up. To check the air filter, remove it from the engine and inspect it for signs of dirt or debris. If the air filter is dirty, clean it or replace it with a new one.

The fuel filter is clogged: A clogged fuel filter can restrict the flow of fuel to the engine, which can also prevent it from revving up. To check the fuel filter, remove it from the engine and inspect it for signs of clogging. If the fuel filter is clogged, clean it or replace it with a new one.

The carburetor is dirty or out of adjustment: A dirty or out-of-adjustment carburetor can cause the engine to run poorly, which can prevent it from revving up. To check the carburetor, clean it or have it adjusted by a qualified technician.

The engine is overheating: If the engine is overheating, it will not be able to rev up properly. To check the engine temperature, use an infrared thermometer to measure the temperature of the cylinder head. If the engine temperature is too high, allow it to cool down before attempting to start it again.

What should I do if my Stihl hedge trimmer won’t rev up?

If your Stihl hedge trimmer won’t rev up, you should first try to identify the cause of the problem. Once you have identified the cause of the problem, you can take steps to fix it. Here are some tips on how to fix a Stihl hedge trimmer that won’t rev up:

Clean the spark plug: If the spark plug is fouled, it can prevent the engine from firing properly, which will prevent it from revving up. To clean the spark plug, remove it from the engine and use a spark plug cleaner to clean the electrodes.

Clean the air filter: A dirty air filter can restrict airflow to the engine, which can also prevent it from revving up. To clean the air filter, remove it from the engine and use a clean cloth to wipe away any dirt or debris.

Replace the fuel filter: A clogged fuel filter can restrict the flow of fuel to the engine, which can also prevent it from revving up. To replace the fuel filter, remove the old filter and install a new one.

Adjust the carburetor: A dirty or out-of-adjustment carburetor can cause the engine to run poorly, which can prevent it from revving up. To adjust the carburetor, you will need to consult the owner’s manual for your specific model of hedge trimmer.

Allow the engine to cool down: If the engine is overheating, it will not be able to rev up properly. To allow the engine to cool down, turn it off and allow it to sit for several minutes.

How can I prevent my Stihl hedge trimmer from not revving up?

There are a few things you can do to prevent your Stihl hedge trimmer from not revving up. Here are some tips:

Keep the spark plug clean: A clean spark plug will help the engine fire properly, which will prevent it from not revving up.

Keep the air filter clean: A clean air filter will help to ensure that the engine has adequate airflow, which will prevent it from not revving up.

Replace the fuel filter regularly: A clogged fuel filter can restrict the flow of fuel to the engine, which can prevent it from not revving up.

Adjust the carburetor regularly: A dirty or out-of-adjustment carburetor can cause the engine to run poorly, which can prevent it from not revving up.

Allow the engine to cool down properly: If the engine is overheating, it will not be able to rev up properly.

What should I do if my Stihl hedge trimmer still won’t rev up after I’ve tried all of these things?

If your