The noise difference between an old motorcycle and a newer one upon starting can be attributed to several factors:
Engine design: Older motorcycles often have simpler engine designs with fewer components and less advanced technologies compared to newer models. These older engines may have looser tolerances, which can result in more mechanical noise during startup.
Wear and tear: Over time, the components of an engine can wear down, leading to increased mechanical noise. Older motorcycles might have experienced more wear and tear, resulting in louder noises during startup.
Maintenance: Proper maintenance plays a crucial role in minimizing noise levels. If an older motorcycle has not been maintained regularly, the components may be more prone to producing noise due to wear, inadequate lubrication, or loose parts.
Vibration dampening: Newer motorcycles often incorporate advanced technologies and design features aimed at reducing vibration and noise. These can include rubber-mounted engines, improved engine balancing, and the use of noise-absorbing materials. These features contribute to a quieter startup experience.
Exhaust system: The design and construction of the exhaust system can significantly affect the noise levels produced during startup. Newer motorcycles often have exhaust systems with better noise reduction features, such as mufflers or silencers, resulting in quieter operation.
Improved manufacturing techniques: Advances in manufacturing techniques and quality control have allowed newer motorcycles to be built with tighter tolerances and improved precision. This can result in reduced mechanical noise during startup compared to older motorcycles.
It's important to note that some degree of noise during startup is normal for motorcycles, regardless of their age. However, if you notice excessive or unusual noises that persist beyond the initial startup phase, it may indicate an underlying issue that requires attention from a qualified mechanic.