What is the normal compression for a 50 hp Johnson motor Model 1958?

The normal compression for a 50 hp Johnson motor from 1958 typically ranges between 100 to 120 psi per cylinder. It's essential to ensure each cylinder maintains similar compression readings for optimal performance. If the compression is significantly lower, it may indicate issues such as worn piston rings or damaged valves. Regular maintenance and checks can help keep the motor running smoothly.