Re: prop size
i got a 87johnson20hp on a 14'aluminum boat and i run a 13 pitch prop and hit 5040RPM's.I'd imagine your 30 could probably turn a 10/15 on that light boat.Definately get a tach though,just to make sure your running in the proper RPM range.I got mine from tinytach.Best $40 i spent for my motor.