The decision to design and manufacture a motorcycle with a specific engine configuration, such as an inline 4, is based on a variety of factors including performance goals, market demand, cost considerations, and overall design philosophy.
Market positioning: Kawasaki has positioned the Ninja 650 as a versatile and accessible middleweight sportbike. By utilizing a parallel-twin engine configuration, they aim to strike a balance between performance, affordability, and ease of use. An inline 4 engine configuration would typically be associated with higher performance and cost, potentially moving the Ninja 650 into a different market segment or pricing range.
Power characteristics: Inline 4 engines are known for their high-revving nature and peak power at higher RPMs. On the other hand, parallel-twin engines, like the one in the Ninja 650, often offer stronger low and mid-range torque, which can provide good acceleration and everyday usability. This engine configuration may be more suitable for the intended target audience and riding preferences of the Ninja 650.
Design and packaging: Motorcycle design and packaging play a significant role in determining the overall form and dimensions of a bike. Inline 4 engines tend to be wider, which could affect the overall size, weight distribution, and handling characteristics of the motorcycle. By using a parallel-twin engine, Kawasaki can maintain a more compact and balanced design for the Ninja 650.
Cost considerations: Manufacturing motorcycles with inline 4 engines can be more complex and expensive compared to parallel-twin engines. By using a parallel-twin configuration, Kawasaki can offer the Ninja 650 at a more affordable price point, making it accessible to a wider range of riders.
It's important to note that these are general considerations, and Kawasaki's specific reasons for not producing an inline 4 variant of the Ninja 650 may be influenced by a combination of these factors along with their strategic goals and market research.