What should be the Compression on 150 hp 2 stroke mercury outboard?

For a 150 hp 2-stroke Mercury outboard, ideal compression typically ranges from 90 to 120 psi per cylinder, but it can vary based on the specific model and age of the engine. It's important to check the manufacturer's specifications for the exact model. Consistent compression readings across all cylinders are crucial; a significant difference may indicate engine wear or issues. Regular maintenance and checking compression can help ensure optimal performance and longevity.