I have a 98 mariner 300 super mag been running a25 pitch power tech tro 4 since I got my boat pulls strong my wife fishes with me and she don't like speed in a boat went to run my 28 pitch hydro motive q4 ot by myself this weekend was having trouble out of jackplate and a pump leaking didn't get to stay long but prop really lugged the engine down when it did break over the prop would blow out don't know if it's a problem with the prop or an engine issue I would think the engine should have no problem spinning a 28 pitch prop any suggestions waiting on seals for jackplate before I take it out again