The positioning and price of these two motorcycles are different. Joy is higher-end and more expensive, but these two motorcycles belong to the same product line and use the same engine. Therefore, the more affordable cloud Xi has been welcomed by many consumers. Both motorcycles are 100cc pedal motorcycles, and both motorcycles use 100cc single cylinder engine. The scooter is a very common means of transportation, which is very suitable for driving on congested urban roads. Moreover, the scooter is easy to operate and does not need to shift gears, so it is also loved by many female consumers. Motorcycles have more power and longer cruising range than electric vehicles. Most scooters will use a gasoline four-stroke engine, which works in the same way as an automobile engine. A four-stroke engine has four strokes when working, namely, intake stroke, compression stroke, power stroke and exhaust stroke. When the engine is in the intake stroke, the intake valve will open and the engine piston will suck the combustible mixture downward. When the engine is in the compression stroke, the intake and exhaust valves will be closed and the piston will rise to compress the combustible mixture. When the engine is in the power stroke, the intake valve and exhaust valve will be closed, and the spark plug will ignite the combustible mixture. When the engine is in the exhaust stroke, the exhaust valve will open, and at this time, the piston will rise to exhaust the exhaust gas.