Re: missing prop
I assume the 1548 is a basic jon boat pretty light??
The 11" prop is right in the middle of the chart with the most models
available. That tells me it is the typical size.Your boat appears to be typical of what you might expect to find a 25 on.Your actual selection would depend on
your actual dry weight and typical load. I would start with an 11.Any time you make a prop change/selection it would be very good to have a Tach and speedo or gps to tell if your operating within expected ranges. A tiny tach is about $40. and easy to install.The little 4 strokes generally do require careful prop selection and setup.