The categorization of a motorcycle engine size as "large" can vary depending on the context and perspective. In general, a 650cc motorcycle engine is considered to be on the larger side when compared to smaller engine sizes commonly found in commuter bikes or beginner motorcycles.
In some countries, motorcycles with engine sizes over 1,000cc are often considered large or even "superbikes."
It's worth noting that the perception of engine size has evolved over time, and advancements in technology have allowed smaller engines to deliver impressive performance. Ultimately, whether a 650cc motorcycle is considered large can depend on various factors such as regional norms, market trends, and individual perspectives.