9 Causes Why Troy-Bilt String Trimmer Is Slow and Buggy

It’s hard to get anything done if your string trimmer keeps sputtering and running roughly. I compiled this manual to serve as a reference as you investigate the root of the issue and discover a solution.

When the gasoline is old, the carburetor is dirty, the fuel line is clogged, the fuel filter is plugged, the spark plug is dirty, the fuel tank vent is clogged, the air filter is clogged, or the spark arrestor screen is clogged, the Troy-Bilt string trimmer runs poorly and stalls.

To begin fixing the spark plug, the boot must be removed. It is imperative that you observe all of the safety measures outlined in your Troy-Bilt’s maintain.

troy bilt trimmer

Your Troy-Bilt String Trimmer is Noisy and Slow

Using stale gas in a Troy-Bilt string trimmer

The quality and age of the fuel are major factors in why a Troy-Bilt string trimmer begins to have issues. If your trimmer is having performance issues, the first thing to check is the fuel.

The gas may oxidize and decompose if left alone for too long. A Troy-Bilt engine may suffer as a result of this.

Ethanol, an alternative fuel that is typically included in gasoline, is known to attract moisture to the fuel system. In addition to separating from gas, the ethanol and water mixture leaves behind varnish, which could reduce the amount of fuel reaching the engine.

The efficiency of an engine depends on the gasoline being used while it is still fresh and of the proper sort.

When choosing gas for your Troy-Bilt string trimmer, keep the following in mind:

  • Get new unleaded gas with an octane value of 89 or higher and no more than 10% ethanol added.
  • Two-stroke motors necessitate a 50:1 2-cycle oil blend. Fuel for a two-cycle engine should be a mixture of gasoline and two-cycle engine oil.
  • A straight gas is needed for 4-cycle engines.
  • Use all fuel within 30 days.
  • If you won’t be using the fuel within 30 days, a fuel stabilizer can help it last longer.
  • Keep fuel inside, away from moisture and ignition sources.

READ: This is the Gas and Oil Fuel Mix Troy-Bilt String Trimmers Use.

The ANSWER is to get rid of the stale gas in the tank. String trimmer fuel is stabilized, the fuel system is cleaned, and moisture is reduced when you mix in a fuel stabilizer, such as Sea Foam Motor Treatment or STA-BIL.

Put the fuel mixture in the gas tank and let the engine run for five minutes to let the fresh fuel circulate. Perhaps the Troy-Bilt string trimmer will start functioning more smoothly.

If it doesn’t solve your running problem, keep going down the list until you locate the culprit.

A Troy-Bilt String Trimmer with a Clogged Fuel Filter

There is a little cylinder-shaped component inside the fuel tank that is connected to the fuel line. Its job is to filter fuel, preventing debris from getting into the fuel system and wearing down the engine.

A clogged fuel filter prevents fuel from reaching the carburetor. The trimmer’s performance will suffer as a result.

When the gasoline filter in your Troy-Bilt becomes clogged, you can replace it by following these steps:

  • Arrange the trimmer in a horizontal position.
  • Cleanse the area surrounding the fuel cap with a damp rag before removing it.
  • Before replacing the fuel filter, make sure you mark its location inside the tank.
  • With the help of a cleanse, bent wire, remove the fuel filter from the tank.
  • Pull the filter out of the gasoline line by firmly grasping the fuel line.
  • Refresh the fuel filter that sits at the fuel pump’s outlet.
  • Reinstall the fuel filter inside the tank.

Troy-Bilt String Trimmer with a Blocked Fuel Line

The fuel line might become blocked by deposits of old fuel’s gummy residue. Because of this, the gasoline supply will be cut off before reaching the carburetor.

If you notice a clog, kink, puncture, or leak in your Troy-Bilt line, you need to replace it with a new fuel line.

Troy-Bilt String Trimmer with a Filthy Carburetor

In order for the Troy-Bilt to start and run, the carburetor controls the ratio of fuel to air during combustion.

Not having the right fuel-to-air ratio can cause the string trimmer to sputter. Carburetor passages can become blocked, and the tiny parts that make up the carburetor can cling.

The Troy-Bilt carburetor may stop working properly and not supply the engine with adequate gasoline if this happens.

You may try cleaning the carburetor to see if it helps. In the event that cleaning the carburetor is unsuccessful, you will either need to repair it (if rebuild kits are available for your particular model) or replace it.

Carburetors often break down because of old fuel being pumped through them.

Use new fuel to keep the carburetor in good shape. Use a non-ethanol fuel, such as TruFuel 40:1 Premix for 2-cycle engines or TruFuel 4-Cycle for 4-cycle engines, to prevent damage to the carburetor from ethanol.

Troy-Bilt String Trimmer with a Grimy Spark Plug

Your Troy-Bilt may misfire and operate poorly because of a dirty spark plug.

Your string trimmer may not be functioning properly because of a worn or damaged spark plug, an improper spark plug gap, or a loose spark plug wire.

To fix this, just unscrew the spark plug with a socket wrench. Make sure to inspect it. If the spark plug’s tip looks particularly dark, if the porcelain is fractured, or if the electrode is burned, you should replace it.

If the spark plug is otherwise functional but dusty, you can either cleanse it with a wire brush or substitute it.

Using a feeler gauge, verify that the spark plug gap satisfies the requirements set out by the engine manufacturer. Put in a new one, or cleanse the one you have. Check that the wire connecting the spark plug is properly fastened.

Troy-Bilt String Trimmer with the Blocked Fuel Tank Vent

When fuel is being used, air needs to be able to enter the tank, hence a vent is necessary. Blocking the vent prevents petrol from escaping the tank and reaching the carburetor.

This will lead to sluggish performance and possible engine failure. Most Troy-Bilt string trimmers have a gasoline tank vent integrated into the fuel lid.

If the gasoline pump isn’t working and there isn’t a blockage in the fuel line, the fuel filter, or the carburetor, it could be that the fuel tank’s vent is clogged.

The use of a pressure gauge can reveal a blocked fuel tank vent. If you don’t have a gauge, you can also run the engine with and without the fuel cap tightened to see if the tank vent is blocked.

The first step is to remove the gasoline cap and let some air into the tank. Launch the hedge trimmer and let it operate. Take care to avoid leaking gas by holding the string trimmer upright.

If your Troy-Bilt trimmer bogs down or runs rough, but it runs strong otherwise, try tightening the fuel cap and seeing if the problem persists; if so, the fuel tank vent is likely to blame.

If, after reinstalling the fuel cap, your trimmer continues to act up and run roughly, you should replace the gasoline tank.

Using a Troy-Bilt String Trimmer with a Clogged Air Filter

A Troy-Bilt string trimmer won’t start without an air filter. In doing so, it safeguards the engine by preventing debris from entering the air filter.

If you don’t regularly inspect, cleanse, and replace the air filter in your trimmer, it can get so clogged with debris that it prevents the machine from receiving enough air to function.

If there isn’t enough air, the motor will sputter and sputter. To prevent the engine from overheating from a shortage of air, it is crucial to maintain cleanse air.

Always use the air filter on your string trimmer. The engine could be permanently damaged if you do this, and the warranty would be voided as a result.

Check the air filter and cleanse it according to the instructions below, assuming it is in satisfactory condition. A new filter should be installed if the old one is severely clogged, broken, or covered in fuel.

How to cleanse the air filter on a Troy-Bilt FOAM string trimmer:

  • Take the air filter out of its housing.
  • You can cleanse the foam air filter with water and a mild detergent.
  • The filter should be washed in cleanse water and then left to dry in the open air.
  • After the filter has dried, lightly saturate it with¬† SAE 30 motor oil. Remove any extra oil by squeezing the filter.
  • Place the filter back into its original location.
  • Reconnect the air filter’s protective cover.

Because there are so many variations in the air filters used by Troy-Bilt, instructions for cleaning a specific model’s filter should be found in the product’s owner’s handbook.

Troy-Bilt String Trimmer with a Clogged Spark Arrestor

A Troy-Bilt string trimmer has a safety screen that prevents hot exhaust material from blasting out and burning someone or sparking a fire. Carbon accumulation on this tiny screen will impair the performance of the engine.

You need to take the wire off of the spark plug. Take off the hood and the exhaust cover. With a metal brush, ake out the spark arrestor screen very cautiously.

Put in place the new spark-proof screen after cleaning it. The engine cover and the exhaust cover must be reattached. To reconnect the spark plug wire, please.

A new spark arrestor screen must be installed if the old one is too dirty, broken, or has a hole in it to be repaired.

Adjusting Troy-Bilt String Trimmer Carburetors

It’s possible that adjusting the carburetor’s jets will be required to achieve the desired variation in engine speed between idle and wide open throttle. The trimmer’s harsh operation could be due to the engine running too lean or too rich.

The carburetor has adjusting screws for this purpose, although you’ll probably need a specialized instrument.

If the above-mentioned solutions don’t work, take the trimmer to a Troy-Bilt service center to have a technician check it out and maybe modify the carburetor. If the carburetor is over-tweaked, the engine could be ruined.