Two Stroke Engines vs Four Stroke Engines

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Michael Venezia January 6, 2012 Block 3 4 Strokes vs. 2 Strokes For many years two strokes dominated free style and motocross. After 2001’s AMA outdoor nationals, Doug Henry, dominated the point series for the nationals taking the championship in the 250cc class on a four stroke. This was a trade mark in motocross history. The impact of this created a change for motocross worldwide. Many riders switched to four stokes, creating a rival between the two bikes. The engine for the two bikes had two completely different handling and power. The four stroke has much more power in the bottom end. The power is much more consistent and controlling. Two strokes are known for their screaming power in the top end. The two stroke is only dominant in the top end and racing in the bottom end is not an option. They are much lighter than four stokes and are best used for freestyle with this advantage. The maintenance for these two bikes come with advantages and disadvantages, such as the fuel cost for the two stoke. The fuel for the two stroke needs an oil mixture in order for it to run properly. The yearly average fuel cost is much more than the four stroke, which intakes non-mixed fuel. The engine maintenance is much more costly, when it comes to two-cycles. The four stroke engine consists of a piston and barrel, and the cylinder block which holds the valve train. The number of valves may vary with different bikes. On the other hand two strokes mainly consist of a piston, connecting rod and crankshaft. With less internal parts, the two strokes maintenance budget is much less. The two stoke bike is much more dominant in the world of Fmx. (freestyle motocross) Their light weight bike allows for better control and maneuverability in the air and the Sand. However four strokes are clearly used for racing motocross, supercross, and other various competitive racing sports. The

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