AMA supercross has been around for a very long time. Since the early 1970s when the first race was in the Super Bowl and it was called Super Bowl Motocross, then came the term and beginning of Supercross. In supercross, these were tracks in tight turns with rhythm sections of big jumps and sections of woops. The motorcycles that first rode on these tracks were 2-stroke motorcycles, meaning they were high revving motorcycles which at the time were the fastest motorcycles of that era, but there were many problems with the bike which I will explain. Supercross has changed over time the bikes, the tracks and the pace of the race. To start with some facts and information about an official 2 stroke 125cc and 250cc racing motorcycle. The 2-stroke dirt bike is a bike whose engine runs on a mixture of gasoline and oil where gasoline and oil are mixed in the gas tank. The dirt bike is also cooled by a radiator and coolant in the radiator. Coolant is antifreeze. The 2-stroke engine is a 2-stroke engine, which means that for every 2 cycles of the engine, there is 1 power stroke. The 2 stroke has a cylinder in which there are two holes at the bottom of the cylinder when the piston goes down and the holes are opened the gases that have just been burned and exploded are pushed out of one hole by the fresh air and the new gases arriving. through the other everything. Then the piston goes back up and closes the holes then compresses the air and gas together, then there is a spark from the spark plug which ignites the fuel and air mixer, pushing the piston back down and restarting the cycle. Now this has happened with incredible speed. At 12,000 rpm, the engine spins at 200 revolutions per second. The motor therefore performs 200 of the cycles that I described to you above in 1 second. This...... middle of paper...... e fuel and air, then again the spark plug provides a spark igniting the mixer creating the power stroke sending the piston back down, restarting the cycle. This engine has much more compression and only consumes gasoline and air. The oil being completely separated from the gas. This engine was much more reliable because it didn't run as fast or get as hot, it lasted much longer and almost never needed to be rebuilt. All it took was fresh oil, coolant and a new spark plug to keep these bikes running and as they were not rebuilt between each race, the bike would therefore be no different from the one they had raced on in the previous race. keep the rider more comfortable and better control the power of the bike. This led to faster lap times, safer motorcycles, and ultimately a whole new style of racing for the world of Supercross..