Premix

Two-stroke engines require a mixture of fuel and oil called premix in order to maintain proper lubrication. Two stroke engines burn this oil that is mixed with the fuel, which is why two stokes typically smoke out the exhaust pipe. Most motorcycle manufacturers are dropping their two stroke models due to the difficulty in meeting emission standards because of this. Premix is made by mixing gasoline and oil at a specific ratio. Many manufacturers of two-stroke powered motorcycles recommend a ratio of 30:1 - that is 30 parts fuel to 1 part oil by volume.

See: Mixing Two Stroke Oil