I have a maxum 1900SR year 1999 speeedboat.
Recently i change the engine , a volvo penta MPI 270HP , V8 , but the leg is a volvo SX cobra from a 6 cilinder ratio 1.78(or1.79) .
First we used an original 23 pitch volvo prop , and it felt like a lot of slip . , did about 45 mph 5000RPM
Changed...