Why does a polaris scrambler smoke?

Because its a two stroke meaning that there is oil mixed into the gasoline even though you don't put it in the gas it is under the seat in a separate tank and it mixes it itself before it goes into the engine and it burns the oil in the engine causing it to smoke two strokes fire every other revolution of the piston causing there to be more heat needing oil in the gasoline to keep the engine cool and four strokes fire every 4 revolutions of the piston that's why they have oil that you have to replace and they do not burn the oil