When comparing motorcycles from different eras, it's important to consider various factors that can contribute to differences in performance, despite advancements in technology. Here are a few factors that could explain the performance disparity you mentioned:
Engine Technology: While the Kawasaki 650 produced in 1965 may have had a carbureted engine, it's worth noting that engine technology has significantly evolved over the years. Modern fuel injection systems offer precise fuel delivery and control, resulting in improved fuel efficiency, smoother power delivery, and reduced emissions. Although the Royal Enfield Interceptor may have a fuel-injected engine, other design factors and specifications can influence its performance.
Design and Engineering: The design and engineering of motorcycles have evolved significantly over time, including improvements in frame geometry, suspension systems, brakes, and overall construction. Modern motorcycles are often engineered for improved handling, stability, and safety. These advancements can result in motorcycles that may not have the same raw power figures as older models but provide better overall performance and riding experience.
Emission Regulations: Stringent emission regulations have played a significant role in shaping modern motorcycle engines. In an effort to meet emission standards, manufacturers may prioritize fuel efficiency and reduced emissions over raw power output. This can result in a trade-off between power and environmental considerations, leading to a more conservative power output in some cases.
Weight and Aerodynamics: The weight and aerodynamics of motorcycles can greatly affect their performance. Older motorcycles, such as the Kawasaki 650 from 1965, may have been lighter and had different aerodynamic characteristics compared to modern motorcycles. Reduced weight and improved aerodynamics can contribute to better acceleration and higher top speeds.
It's important to note that the performance of motorcycles can vary significantly based on their specific design, tuning, and intended purpose. While the Royal Enfield Interceptor may not have the same power figures as the Kawasaki 650 from 1965, it may excel in other areas such as reliability, ease of maintenance, and modern features. Additionally, rider preferences and intended use should also be considered when evaluating the performance of different motorcycles.