How To Use a Gas String Trimmer

It’s relatively easy to use a gas string trimmer, since manufacturers usually construct these types of equipment to be as user-friendly as possible. However, it does take considerable preparation and caution to operate it, especially if you have no past experiences in handling one. With this in mind, we prepared a quick and meaningful guide to help you understand your gas string trimmer better.


Before taking your gas string trimmer out to work on your lawn, there are a few things that you have to do to ensure that the equipment will run smoothly and effectively while operating it. To help you out, here are some things that you have to check and do before starting your trimmer up.

Lawn Arrangement

Before anything, it is recommendable that you prep your lawn before doing an actual trimming on it. A string trimmer uses a special kind of line to cut through various types of greenery; However, this mechanism is prone to various concerns whilst doing the job. Make sure to remove objects that the trimmer line could throw or that could become entangled with the trimmer head.

Warn your family members as well that you will be working on your lawn. Make sure that no one is going to be in your workspace once you start working.

Familiarity with Control and Safety Features

Needless to say, you have to understand how your trimmer works before using it. This is to prevent any accidents from happening. While you’re at it, you also have to make sure that the trimmer is assembled correctly. Inspect the parts and components as well. Make sure that they are properly attached to the trimmer.

Fuel System Preparation

The best gas string trimmer 2019 have engines that utilize oil or gasoline to operate. Of course, this means that you will need to top up the fuel system with gasoline. However, the fuel requirement of your trimmer will highly depend on the type of engine it has. These engines are categorized into two:

  1. Two-stroke or Two-cycle Engines
  2. Four-stroke or Four-cycle Engines


Now, these two categories have their distinct characteristics, but the most important distinction between them is their fuel requirement. Four-stroke engines are mainly powered by gasoline alone, so filling them up require less effort and time. Two-stroke engines, on the other hand, require a mixture of gasoline and lubricating oil to properly function.

Mixing Fuel for Two-Stroke Engines

For two-stroke engines, the general oil to gas ratio is 1:50. This is equivalent to 20 ml of oil per liter of gas. To guide you better, we have provided a conversion table for an equipment with a 1:50 ratio.

Fuel Mixture Oil Gasoline
1 liter 20 ml 1 liter
5 liters 100 ml 5 liters


Sometimes, manufacturers recommend different measurements for their equipment. Other oil to gas ratio that is commonly used in mixing fuel for two-stroke engines are 1:25, 1:30, and 1:40. This is why, it’s better to consult the manufacturer’s manual before doing any actual mixing.

Note: Never attempt to use 4-stroke motor oil in a 2-stroke engine. It contains additives that can possibly contaminate the cylinder and tar up the piston of your engine.

Friendly Tip: Bottles of pre-mixed fuel for 2-stroke engines are available in the market. You can opt to purchase one if you are having a hard time mixing gas and oil.

Trimmer Line Management

The string plays a vital role in a string trimmer. It serves as the cutting component of the equipment. This is why, it is also vital that you make sure that the line is set properly into the cutting head before doing any work.

Spool Winding

Oftentimes, your trimmer comes with a spool of line or string upon purchase. But in case you are in need of line replacement or you simply have to wind it around the spool, here is how you can do it.

  1. Take out the empty spool from the string trimmer.
  2. Thread the end of the line into the hole in the spool.
  3. Wind the line tightly around the spool in the direction of the arrow.
  4. Leave an excess length before the other end of the line. .
  5. Place the spool back in the string trimmer.
  6. Feed the other end of the line into the hole in the cutting head.
  7. Place the cap to cover the spool.
  8. You’re ready to go!

Note: Pull the line to create tension as you wind. This will prevent loosely-winded line that might cause problems for both automatic and bump feed string trimmers while operating.

Personal Protective Equipment

Above all preparational concerns, the most important part is to protect yourself to prevent any injuries and accidents while working on your lawn. We cannot emphasize enough how vital it is to wear protective gears when operating with an equipment such as a trimmer.

Remember to wear safety goggles or a visor to protect your eyes in case the line snaps or the trimmer throws debris around. Wear heavy trousers and safety shoes to protect your legs and feet while at work. Avoid wearing shorts, sandals, or flip flops.

Lastly, wear ear muffs to protect your ears. Most gas string trimmers produce high sound decibels that may cause hearing damage when frequently exposed for a long period of time.



Once you’ve properly inspected your equipment and readily worn protective gear, you are finally ready to give your gas string trimmer a go!


How to Start a Gas String Trimmer

Most gas string trimmers have a pull-start mechanism. This involves pulling a cord to power up the engine of the trimmer. However, some manufacturers install added start-up procedures for safety purposes. This is why, we have recommended that you try to familiarize yourself with the controls and mechanisms of your trimmer as preparation for using it. If you’re still unsure, feel free to consult and follow the manufacturer’s manual or instructions about starting procedures.

How to Cut with a Gas String Trimmer

Many people think that cutting with a string trimmer only requires the equipment to be hovered over where you want to trim. In a way, this is true. However, there are helpful angles and techniques that can help you maximize your trimmer’s full cutting potential.

Friendly Tip: Always angle your cutting head when trimming so the cut material is thrown away from you.

Cutting Techniques


This involves pitching the tips of the strings toward the object to cut. This allows the string to strike the object at a slight angle, giving it a tapered look.


Edging is a technique wherein the cutting head is positioned vertically to effectively trim edges. Expect that debris will fly around, so we suggest that you position yourself behind the trimmer, so you won’t get hit.


Scything can be used when working on areas that are obstructed. The technique involves carefully bringing your trimmer to work in a U-motion to cut around the obstacle evenly.

For more read How does an automatic feed string trimmer work? and How to store gas string trimmer enjoy!

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