my 150 optimax wont turn a 19p tempest plus on my boat (max rpm is 5000 with that one), bought a 17p tempest plus and gained 400rpm so it put me at 5400 rpm, raised the motor another hole hoping to gain another 100-150 rpm but ended up losing 100 rpm and it put me at 5300 max trimmed out, can figure out why I lost rpm instead. im looking for someone to work on the 19p tempest to repitch it to a 17 and maybe shave some weight off it to get my rpms up a bit more. think they call it labbed or blueprinted, something like that, and keep the 17p as a spare. just thinking about this right now whether I want to go that route or not but id like to talk with whoever first to see if they can do it. thanks again for the recommendations . either that or sell the 19p and try another prop out