he has a 38 zero tolerance (Cigerette splash) it weighs 11000 it has 2 yanmar 440hp w #3 drives it runs 51 GPS @ 4000 rpm the yanmar. The props hes running are clever 27. The rep for Yamnar said it should be at 3500 @WOT he wants to go faster what do you recomened he was thinking of changing gears & props?

not a lot of deisel guys around here, can manufacturer help him?

oh i know...

they are really guessing at this time it seems, just trying to steer him in the right direction.