A bought a 2002 4 stroke Yamaha 115 hp. It's on a 18.6 seaswirl 1851 cc 2650 lbs. On a full throttle it only max. to 25 mph. What prop should I get so it can deliver it's max. performance? I think the prop does it have right now is 13K, K I didn't see the pitch,(painted prop)-(white). Any...
