The petrol oil ratio for a Husqvarna brush cutter is 50:1 (2%) when using Husqvarna two-stroke oil.
Getting the correct fuel mix ratio is essential for the performance and longevity of your two-stroke Husqvarna brush cutter engine. An incorrect mixture can lead to poor performance, excessive smoke, or even severe engine damage.
Understanding the 50:1 Ratio
The ratio 50:1 means that for every 50 parts of unleaded petrol, you should add 1 part of two-stroke oil.
- 50 parts Petrol: This is the main fuel component.
- 1 part Oil: This oil is specifically designed to lubricate the internal parts of a two-stroke engine as it mixes directly with the fuel and burns during operation.
The reference also states this ratio is equivalent to 2% oil in the mixture. This means 2% of the total volume of the mixture is oil, and 98% is petrol.
Why Use the Correct Ratio?
Using the recommended 50:1 ratio with Husqvarna two-stroke oil ensures:
- Proper Lubrication: Protects engine components like the piston, cylinder, and crankshaft from wear.
- Efficient Combustion: Helps the engine run smoothly and reduces spark plug fouling.
- Reduced Emissions: Minimizes smoke and harmful exhaust gases compared to richer mixes.
- Engine Longevity: Prevents overheating and premature failure caused by inadequate lubrication.
The Importance of Oil Type
It's crucial to use a high-quality two-stroke oil specifically designed for air-cooled engines. The provided reference explicitly mentions using Husqvarna two-stroke oil to achieve the 50:1 ratio. Using other types of oil or incorrect ratios, even with quality oil, can harm the engine. Always consult your brush cutter's manual for the most accurate information, as ratios can sometimes vary slightly between specific models or based on local regulations/fuel types.
Mixing Your Fuel
Mixing the fuel requires precision. It's best to use a dedicated fuel mixing container with ratio markings.
Here's a simple guide:
- Start with the Petrol: Pour the desired amount of fresh unleaded petrol into the container.
- Add the Oil: Measure the correct amount of Husqvarna two-stroke oil according to the 50:1 ratio for the volume of petrol you added.
- Mix Thoroughly: Securely close the container and gently shake it to ensure the oil and petrol are well mixed.
- Use Fresh Fuel: Only mix the amount of fuel you expect to use relatively soon (within a few weeks), as mixed fuel can degrade over time.
Ratio Examples (Approximate)
Here is a table showing common volumes:
| Petrol Volume | Husqvarna Two-Stroke Oil (50:1 Ratio) |
|---|---|
| 1 Litre | 20 ml |
| 5 Litres | 100 ml |
| 1 Gallon | Approx. 2.5 oz (75 ml) |
Note: Always use measuring tools designed for fuel/oil mixing to ensure accuracy.
Using the precise 50:1 ratio with the recommended Husqvarna two-stroke oil is the key to keeping your brush cutter running efficiently and reliably.
