How much compression should a 250cc engine have?

The typical compression ratio for a 250cc engine can vary depending on the engine design, manufacturer, and fuel type. Generally, a 250cc motorcycle engine can have a compression ratio ranging from around 10:1 to 12:1. Compression ratios higher than this may be found in high-performance engines. This ratio indicates how much the air and fuel mixture is compressed before ignition, which affects the engine's efficiency and power output.