Husqvarna Chainsaw Fuel Mix (Ratio Chart)
For a Husqvarna two-stroke chainsaw, use the fuel ratio stated in that saw’s operator’s manual. Many models specify 50:1, or 2% oil, but the ratio and approved oil are model-specific. At 50:1, add 20 mL of two-stroke oil per litre of gasoline, or 2.6 US fl oz per US gallon.
Getting ready to cut, then finding an empty fuel can or a dry oil tank, is a common garage delay. A reliable routine starts with the exact saw model, its manual, and measured fuel—not a guess based on another Husqvarna or a bottle cap. I use the chart below only after confirming that the manual calls for 50:1.
Fuel Mix, Equipment Setup & Safety Preparation
This section covers how to confirm the correct Husqvarna fuel ratio, measure a 50:1 mixture, and prepare the saw safely. The key point is simple: 50:1 is common, not universal. Check the manual for your exact model and use an oil approved for its engine.
How to confirm your saw’s fuel ratio
The fuel ratio is the volume of gasoline compared with the volume of two-stroke oil. At 50:1, there are 50 parts gasoline to one part oil. That equals 2% oil in the total mixture, when measured by volume.
Find the model identification on the saw and check its operator’s manual. Do not rely on a general chart, a different model’s instructions, or a previous owner’s setup. Some models or manuals may specify a different ratio or oil. Follow the manual exactly.
Use fresh, unleaded gasoline at the octane rating specified in the manual. Husqvarna generally advises using fuel with no more than 10% ethanol, or E10. Use suitable air-cooled two-stroke oil approved for the saw. Bar-and-chain oil, four-stroke engine oil, and an unverified two-stroke oil are not substitutes.
50:1 fuel mix chart
This chart applies only when the manual for your saw specifies a 50:1 gasoline-to-oil ratio. Measure both liquids with suitable markings; small measuring errors matter more in small batches. US gallons and US fluid ounces are used in the table.
| Gasoline | Two-stroke oil at 50:1 |
|---|---|
| 1 L | 20 mL |
| 5 L | 100 mL |
| 1 US gallon | 2.6 US fl oz |
| 2 US gallons | 5.1 US fl oz |
At 50:1, a 1 L batch uses 20 mL of oil. Do not use the chart to “correct” stale fuel, poor-quality oil, or an engine problem. Adding extra oil changes the specified mixture; it does not repair a fuel or engine fault.
Mix the fuel accurately
I’ve seen a rushed mix create doubt before a cut: the operator remembers adding oil but not how much. A marked container and a written ratio prevent that uncertainty. For example, if the manual confirms 50:1 and you need 5 L of fuel, measure 100 mL of approved two-stroke oil.
- Work outdoors or in a well-ventilated area, away from flames, sparks, and other ignition sources.
- Use a clean, approved fuel container. Measure the gasoline and oil with clear volume markings.
- Add the measured oil and gasoline to the container, close it, and mix thoroughly.
- Label the container with the mixture ratio and date, then follow the manual’s guidance for fuel use and storage.
Never put straight gasoline in a two-stroke saw. Do not change the ratio because the engine smokes, runs poorly, or seems hot. Stop and check the manual or have the saw inspected rather than guessing at a new mixture.
Before starting, inspect the chain brake, throttle lockout, chain catcher, handles, bar, chain, and controls. Wear chainsaw-rated eye and hearing protection, leg protection, gloves, and boots. Set a clear work area and plan an escape path before cutting.
Field Cutting and Landscaping Operation
This section explains what to check after mixing fuel and before making a cut. Correct fuel is one part of a safe setup; the saw also needs chain lubrication, suitable chain tension, and sound controls. Bar and chain specifications vary, so use the saw and bar markings or manual.
With the engine off, check that the bar and chain are approved for your saw. Match the chain pitch, gauge, and drive-link count to the bar and sprocket, and use a bar length allowed by the manual. There is no single chain size or bar length that fits every Husqvarna chainsaw.
Check chain tension and lubrication by the method in the manual. A dry oil tank is a separate problem from an empty fuel tank: fuel powers the engine, while bar-and-chain oil lubricates the cutting attachment. Fill each with the correct fluid in its own tank. Do not pour premixed fuel into the oil tank.
Start the saw using its prescribed cold- or warm-start steps, with the saw secured and the chain brake engaged as directed. Once it is running, confirm the chain stays still at idle. If it moves, stop and follow the model’s manual. Do not start cutting until the chain, brake, and controls behave normally.
Keep a sharp, correctly matched chain on the saw. A dull chain can make cutting slow and can lead an operator to push harder than needed. Do not cut above shoulder height or force a dull chain through wood. Stop, secure the saw, and sharpen or replace the chain as needed.
Maintenance, Chain Sharpening & Engine Tuning
This section distinguishes fuel-related care from other adjustments. A correctly measured mix cannot compensate for a damaged chain, poor lubrication, or a carburetor fault. Use the manual for chain filing details and engine limits; do not set carburetor screws or engine speed by guesswork.
After use, switch off the saw and let it cool before handling the cutting attachment. Engage the chain brake and follow the manual’s steps for cleaning. Remove sawdust and debris from the bar groove, oil holes, and air intake, and inspect the chain and bar for damage.
The correct file size and sharpening angles depend on the chain type. Check the chain markings or the chain maker’s instructions rather than choosing a file from the saw brand alone. Keep the chain’s cutters even and follow the stated filing angle and depth-gauge guidance.
Idle speed, maximum engine speed, and carburetor settings also depend on the model. Use the manual’s RPM limits and tachometer procedure where required. Do not infer a safe wide-open-throttle setting or turn adjustment screws until the engine “sounds right.”
A wrong ratio, straight gasoline, contaminated fuel, or fuel starvation can deprive a two-stroke engine of lubrication and cause severe internal damage. Stop using the saw if it runs abnormally hot, loses power, or makes unusual noises. Do not add extra oil or change carburetor settings to mask those signs.
Storage and Seasonal Care
This section covers keeping fuel and the saw in good condition between jobs. Follow the storage instructions in your model’s manual, since fuel handling and seasonal procedures can vary. Store fuel only in an approved, labeled container and keep it away from heat and ignition sources.
If fuel has been sitting, do not assume it is still suitable. Check the manual and the fuel supplier’s guidance for storage limits and disposal. Never pour questionable or contaminated fuel into the saw to use it up.
For seasonal storage, follow the manual’s directions for fuel left in the tank, cleaning, and storage. Before the next start, inspect the saw, confirm the fuel mixture against the model’s instructions, and check the chain and bar oil. Take time to identify each container before filling either tank.
Quick mix scenarios
These examples show how the chart works when the model manual specifies 50:1. They are not a substitute for checking the manual, especially if your saw requires another ratio.
| Your situation | What to do |
|---|---|
| You have 1 L of gasoline | Measure 20 mL of approved two-stroke oil |
| You have 5 L of gasoline | Measure 100 mL of approved two-stroke oil |
| You have 1 US gallon of gasoline | Measure 2.6 US fl oz of approved two-stroke oil |
| You do not know the model’s ratio | Pause and check the operator’s manual before mixing |
| The engine sounds wrong after refueling | Stop the saw; do not add oil or adjust the carburetor by guesswork |
The safest fast check is model first, ratio second, measuring third. If those details do not agree with the fuel already in the can, do not use that mixture in the saw.
Frequently Asked Questions
These short answers address common questions about Husqvarna two-stroke fuel. The model’s operator’s manual remains the final reference for its ratio, fuel grade, and approved oil. If a symptom suggests an engine fault, stop and check the manual or seek qualified service.
What is the fuel ratio for a Husqvarna chainsaw?
Many Husqvarna two-stroke saws use 50:1, but not all. Confirm the ratio in the operator’s manual for your exact model before mixing.
How much oil goes into 1 L of gasoline at 50:1?
Use 20 mL of approved two-stroke oil for 1 L of gasoline, provided your manual specifies 50:1.
How much oil goes into 1 US gallon at 50:1?
Use about 2.6 US fluid ounces of approved two-stroke oil per US gallon of gasoline.
Can I use the same mix in every Husqvarna chainsaw?
No. Fuel ratios and approved oils can vary by model. Check each saw’s manual rather than assuming the same mix is correct for all of them.
Can I use regular gasoline?
Use fresh, unleaded gasoline at the octane rating specified in the manual. Husqvarna generally advises no more than 10% ethanol, or E10.
Can I use bar-and-chain oil in the fuel?
No. Bar-and-chain oil lubricates the chain and bar. Use only suitable, approved air-cooled two-stroke oil in the fuel mixture.
Should I add extra oil for more engine protection?
No. Use the exact ratio in the manual. Extra oil does not correct poor fuel, the wrong oil, fuel starvation, or an engine fault.
What if I accidentally used straight gasoline?
Stop the engine and do not continue running it. Follow the manual’s service guidance or contact a qualified service provider. Running straight gasoline can quickly damage a two-stroke engine.
Why does the chain move while the saw idles?
The chain should not move at idle. Stop using the saw and follow the manual’s troubleshooting procedure; do not guess at a carburetor adjustment.
Can I store premixed fuel in the saw?
Follow the operator’s manual for storage and fuel left in the tank. For any fuel container, use an approved, labeled container and observe the manual’s and fuel supplier’s storage guidance.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
