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Two-stroke engines usually do not have an internal lubrication system; the moving parts are lubricated by a small flow of lubricating oil which enters the combustion chamber pre-mixed with the fuel. This oil is usually not completely burned during the power stroke, and therefore a portion of it clings to the cylinder walls, passes into the crankcase, and eventually reaches all moving parts of the engine.

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βˆ™ 16y ago
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Q: Why do you mix oil and petrol in a 2 stroke?
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