A Simple & Easy Guide to Mixing 2-Stroke Gas
Mixing fuel is not as daunting of a task as you may think. By the end of this quick guide you'll be a fuel mixin' wizard.
So what is Fuel Mix Ratio?
For 2-cycle engines, instead of having a circulating oil system to maintain lubrication like 4-cycle engines do. 2-cycle engines require oil to be mixed in with the fuel to allow for lubrication. This is where having a proper "mix" of oil & gas is important. It not only helps your engine run properly but can help prevent unnecessary wear & tear.
The fuel-mix ratio your engine requires is something you will need to know prior to beginning the process of mixing as different manufacturers have different ratio requirements like 32:1, 40:1, 50:1, etc,.
The Ratio Formula
Ratio = (Volume of Fuel) : (Volume of Oil)
| Fuel Mix Ratio (Gas:Oil) |
Volume of Gasoline (1 Gal.) |
Volume of Oil | By the Ounce | |||
|---|---|---|---|---|---|---|
| Ounces (oz.) | Milliliters (ml) | Ounces (oz.) | Milliliters (ml) | Oil oz. per Fuel oz. | ||
| 20:1 | 128 oz | 29.57 ml | 6.4 oz | 189 ml | 0.050 oz | |
| 30:1 | 128 oz | 29.57 ml | 4.3 oz | 127 ml | 0.034 oz | |
| 32:1 | 128 oz | 29.57 ml | 4.0 oz | 118 ml | 0.031 oz | |
| 40:1 | 128 oz | 29.57 ml | 3.2 oz | 95 ml | 0.025 oz | |
| 45:1 | 128 oz | 29.57 ml | 2.8 oz | 83 ml | 0.022 oz | |
| 50:1 | 128 oz | 29.57 ml | 2.6 oz | 77 ml | 0.020 oz | |
| 60:1 | 128 oz | 29.57 ml | 2.1 oz | 62 ml | 0.016 oz | |
| 80:1 | 128 oz | 29.57 ml | 1.6 oz | 47 ml | 0.013 oz | |
In other words, this formula means "I need a 32:1 fuel mix, so I have to mix 1 gallon of gas, with 3.2 oz. of oil"