This Gas & Oil Reduces Fuel Issues in Honda String Trimmers

Nowadays, 4-cycle Honda engines power string trimmers. The fuel and oil tanks of these motors both have their own dedicated fill points. Unlike 2-cycle string trimmers, 4-cycle engines DO NOT REQUIRE MIXING GAS AND OIL BEFORE USE.

The problem with starting or running can often be traced back to gas that is too old. Getting the right gas and maintaining it properly might lessen the frequency of fuel-related problems.

Trimmers powered by Honda’s 4-cycle engines need Regular Gas and 10W-30 motor oil.

  • Fuel: Regular unleaded gas with an octane value of 87 or higher and no more than 10% ethanol.
  • Air-cooled engines require 10W-30 engine oil that falls into API service category SJ or later.

If your string trimmer only has one fill port, consult the instructions to learn how much gas and oil it needs.

Honda String TrimmersBefore attempting any diagnosis, repairs, or use of the equipment, be sure to read and fully understand the operator’s manual.If you don’t feel confident in your ability to make the repair or if you lack the necessary expertise or experience, you should get some help from a professional.

Honda String Trimmer with Stale Gas

If your Honda string trimmer suddenly stops working, the problem is probably related to the fuel you’re using. The trimmer may become ineffective, stall, die, or refuse to turn on as a result.

As little as 30 days after purchase, gas might start to degrade and become less effective. The trimmer’s tiny engine isn’t designed to run on ethanol, an alternative fuel sometimes mixed with gas.

Since ethanol has a hygroscopic nature, it will draw water vapor into the fuel system. The varnish and sticky deposits left behind by this moisture and ethanol mixture might limit fuel flow and lead to premature component failures.

The gasoline system and engine are also vulnerable to corrosion.

Never fill up with gas that has more than 10% ethanol in it due to the problems it causes.

Get New Gasoline and a Fuel Stabilizer:

For this reason, you should always buy fresh gas and use it up within 30 days of purchase. Use a fuel stabilizer like Sea Foam Motor Treatment to keep your gas fresher for longer.

The consequences of stale fuel cannot be undone by fuel stabilizers. New gasoline needs stabilizers added to it.

Honda String Trimmers Run on Ethanol-Free Fuel:

You may want to choose a fuel that doesn’t include ethanol to protect your Honda’s engine. These fuels are widely available at home improvement stores and on the internet.

Keeping gasoline on hand ensures that they may be used immediately if necessary. But these are the priciest ways to power a trimmer.

Honda’s 4-Cycle String Trimmer: Fuel and Oil

Fuel for a Four-Cycle Honda String Trimmer

There is no need to mix fuel and oil because Honda 4-cycle engines have dedicated fill points for each.

In order to operate properly, Honda 4-cycle string trimmers need unleaded gasoline with an octane value of 87 or higher and 10% ethanol content or less.

To delay gasoline’s breakdown and cut down on sticky deposits and moisture, a fuel stabilizer like Sea Foam or STA-BIL should be added.

Although using gasoline with a minimal amount of ethanol is permissible, it is not ideal.

Honda recommends using an ethanol-free fuel, which can be purchased in canisters at your local hardware store or online, or at the gas pump at specified gas stations.

The cost of gasoline without ethanol additives is higher. If you don’t want to deal with the potential problems that can arise from putting old ethanol-based gas through a string trimmer, purchasing in canisters may be a smart alternative.

Oil for a Honda 4-Cycle String Trimmer Engine

The oil and gasoline for a 4-cycle engine are both poured in through different ports. For a 4-cycle motor, NEVER combine oil and fuel. Never attempt to operate a 4-cycle string trimmer with 2-cycle oil.

The engine’s moving parts can’t function without oil. Overheating caused by too little or the improper kind of oil can render your string trimmer inoperable and even destroy the motor.

Honda suggests SAE 10W-30 motor oil. Kawasaki makes a high-quality oil for air-cooled engines.

4-Cycle Honda Engine Oil Viscosity

ManufacturerEngine Oil


The efficiency of your Honda string trimmer will vary depending on the gasoline you use. Corrosion and fuel limitation are two effects of aging fuel.

Choosing the right gasoline for your Honda string trimmer is as easy as following these steps:

  • Always fill up with new gas.
  • The gas must have an octane level of 87 or above and contain no more than 10% ethanol.
  • It’s important to recognize your string trimmer’s motor type.

In a 4-stroke engine, regular gas is required

  • You may prevent your gas from deteriorating over time by adding a fuel stabilizer to it.
  • Keep gas away from moisture and flammable materials.