Well the main difference between a 2 stroke and a 4 stroke is the firing process. On a 4 stroke you have 4, hence 4 stroke, intake, compression, power, and exhaust. As for a 2 stroke you have to combine them to get two basically. Generally 4 strokes will have multiple pistons with an oil reserve to lubricate everything but on a 2 stroke there is a point where the gas/oil mixture falls below the piston to work as a lubricant therefore one doesn't put oil in a 2 stroke.
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