The stability of a motorcycle in corners is influenced by various factors, and the engine configuration alone, such as an inline-four, does not determine the stability. While the engine configuration can have some impact, it is just one component among many that contribute to a motorcycle's handling characteristics.
Here are some factors that can affect a motorcycle's stability in corners:
Chassis design: The frame, suspension geometry, and overall design of the motorcycle's chassis play a significant role in its stability. Different motorcycles, regardless of their engine configuration, can have varying chassis designs that affect how they handle in corners.
Weight distribution: The distribution of weight between the front and rear of the motorcycle can affect its stability. Motorcycles with a more balanced weight distribution tend to handle well in corners.
Suspension setup: The quality and setup of the suspension system, including the forks and rear shock absorber, impact the motorcycle's handling characteristics. Properly tuned suspension can contribute to stability and control in corners.
Rider skill and technique: The rider's skill level, body position, and technique have a considerable influence on a motorcycle's stability and cornering abilities. A skilled rider can effectively handle a motorcycle of any engine configuration.
While inline-four engines are often found in sport bikes known for their cornering prowess, it's important to note that motorcycles with other engine configurations, such as V-twins or parallel twins, can also offer excellent stability and cornering performance. Ultimately, the overall design, engineering, and setup of the motorcycle, combined with the rider's skill, are crucial factors in determining its stability and performance in corners.