The variation in crank time, or the time it takes for a motorcycle's engine to start running after the ignition is engaged, can be attributed to several factors, including design, engineering choices, and technology used in the bikes. Here are a few factors that can contribute to the differences in crank time between bikes:
Ignition System: The ignition system plays a crucial role in starting the engine. Different motorcycles may use different ignition systems, such as traditional contact points ignition or electronic ignition. Electronic ignition systems generally provide quicker and more reliable starts compared to older contact points systems.
Compression Ratio: The compression ratio of an engine affects its starting characteristics. Motorcycles with higher compression ratios tend to have more power and efficiency but may require additional cranking time to build up sufficient pressure for ignition. Bikes with lower compression ratios may start up more quickly.
Fuel Delivery System: The type of fuel delivery system employed by the motorcycle can impact the starting time. Carbureted engines may take a bit longer to start as they require the fuel to mix with air in the carburetor before reaching the engine. Fuel-injected engines, on the other hand, deliver fuel directly to the combustion chamber, allowing for faster and more precise starts.
Engine Design and Configuration: Different engine designs and configurations can contribute to variations in crank time. Factors such as the number of cylinders, the arrangement of the cylinders (V-twin, inline, etc.), and the overall engine architecture can influence the starting characteristics of a bike.
Manufacturer's Intent and Tuning: Motorcycle manufacturers may prioritize different aspects when designing and tuning their bikes, leading to variations in crank time. Some manufacturers may prioritize power and performance, while others may focus on smoothness or ease of starting.
It's important to note that the examples you mentioned, Harley-Davidson and Honda, represent two different brands with distinct design philosophies and target markets. Harley-Davidson motorcycles often feature large-displacement engines with a unique V-twin configuration, which can contribute to their longer crank times. Honda motorcycles, on the other hand, encompass a broader range of models with diverse engine configurations and technologies, so it's challenging to make a generalized comparison between the two brands. Crank time can vary even among different models within the same brand due to variations in engine specifications and design choices.