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Should Two Strokes Be Banned? With the invention of more efficient four stroke motorcycles today, two strokes are being threatened. Two stroke motorcycles produce power and release the exhaust all in one revolution of the crankshaft. This gives the user more bang for their buck. Two strokes are have an extremely superb power to size ratio and were the industry standard, until 1997. In 1997, the Environmental Protection Agency (EPA) decided that it was their time to take action against the two stroke. The EPA argued that the two strokes are inefficient and pollute too much into the atmosphere. While this is somewhat true, they are not nearly as bad as the EPA makes them out to be. The exhaust that is seen is in fact the oil being burnt off because two strokes rely on the lubrication of the engine through the fuel. The actual emissions are close, it’s just that the smoke is bein