The four stroke engine adopts a lubrication method that combines splash lubrication and pressure lubrication. Two stroke engines generally use a mixed lubrication method of mixing a certain proportion of QB grade gasoline engine oil into gasoline. However, regardless of the engine operating conditions, the mixed oil of this lubrication method is supplied with lubricating oil in a predetermined proportion, increasing the consumption of lubricating oil, incomplete combustion, more carbon deposition, and exhaust pollution. The new generation of two-stroke engines adopt a separate lubrication method, equipped with a separate lubrication tank and oil pump. The oil pump generally adopts a reciprocating plunger type variable oil supply pump, which is driven by the crankshaft gear through a worm gear and worm. The fuel supply is linked to the carburetor throttle valve through the throttle handle, control cable, and throttle valve, so that the oil supply varies with the engine speed. At high speed, there is more fuel supply, while at low speed, there is less fuel supply, which is reasonable and can save more oil compared to the hybrid lubrication method. The engine oil is blown away by a high-speed mixture to form a small oil mist, which is supplied to the parts that need lubrication, reducing the amount of engine oil entering the combustion chamber. The mixture burns completely, reducing carbon deposition and exhaust pollution.
