Choosing a motorcycle size depends on various factors, including your riding experience, intended usage, and personal preferences. Here are a few considerations for your situation:
Experience: With over 25 years of riding experience, you likely have a good understanding of different motorcycles and their capabilities. You're in a better position to judge what size of bike suits your riding style and comfort level.
Intended usage: If you anticipate occasional motorway riding and don't plan to frequently carry a passenger or a lot of luggage, a 350cc motorcycle can still provide adequate power and performance for most situations. It can handle motorways comfortably, though it may require slightly more effort for overtaking at high speeds compared to larger bikes.
Maneuverability: Smaller motorcycles, such as a 350cc, generally offer greater maneuverability and agility, which can be advantageous in urban environments, tight corners, or congested traffic. If you value nimble handling, a smaller bike might be a suitable choice.
Cost and maintenance: Smaller motorcycles often have a lower purchase price, lower insurance costs, and better fuel efficiency. Additionally, maintenance and servicing expenses might be more affordable for a 350cc motorcycle compared to a larger one.
Ultimately, the decision boils down to your personal preferences and priorities. It could be helpful to test ride both a 350cc motorcycle and a larger one to get a feel for their differences in power, handling, and overall comfort. Considering your experience and the fact that you'll only be on motorways occasionally, a 350cc motorcycle may be a reasonable choice.