Engines Used In Motorcycles?

They are either two-stroke or four-stroke (2-stroke engines are on their way out because they are noisy, inefficient, and they pollute a lot more). They are between one and six cylinders, with twins and fours being most prevalent. They tend to be designed with compactness in mind, and to be more 'high performance' than car engines in terms of HP per pound. They may be air or liquid cooled.

Many advances in car engines over the last few decades were pioneered on motorcycles. Four valves per cylinder, single and dual overhead cams, electronic ignition, etc. became standard on motorcycles before they showed on cars in large numbers. Modern motorcycle engines mostly have overhead cams and multiple valves. In fact modern high-performance sport bikes are so popular, and their manufacturers compete so strongly, that they upgrade these engines every year or two to find ways to add another 5 HP and shave off another 5 lbs. Many of these innovations find their way into car engines in a few years.

Motorcycle engines, made by motorcycle companies. Street bikes are 4 stroke, 1,2, 4 or 6 cylinders, either air or liquid cooled.

generally 4 stroke , water cooled, that are designed to rev fairly high. H-D are 4 stroke , air cooled, V twins that are more for torque (and sound) Some motorcycles are 2 stroke and designed to rev even higher. So, could be almost anything.

Two stroke and four stroke (the most common now). Anywhere between 1 cylinder and 8 cylinders.

Internal combustion engines. 2 stroke and 4 stroke.