Automatic lubrication

Automatic lubrication (also called autolube or auto-lube) refers to a lubrication system on a two-stroke engine, in which the oil is automatically mixed with fuel and manual oil-fuel pre-mixing is not necessary.

This system is commonly used for motorcycles as it eliminates the need of pre-mixing fuel and two-stroke oil.

Vespa is an example where pre-mixing of two-stroke oil is required.

Automatic lubrication was introduced for motorcycles by Velocette in 1913.

[1] An example of application of automatic lubrication system is Suzuki AX100 motorcycle.

Oil injection pump on a Yamaha DX100 - just behind the carburettor (visible on the left) It is the primary component of two-stroke automatic lubrication system. Amount of two-stroke oil injected by the pump depends on the throttle position. A cable from the throttle is connected to the oil pump indicating throttle's position. A tube ensures flow of oil from the reservoir to the oil pump.