[QUOTE=EmptyStringer;1571033]SS that is on it= 48-16930A40-20P (Quicksilver Laser 2)
Original Prop (beat up) = 48-77348A40L-21P (aluminum)

5800 RPM but doesn't want to plane off. Can anybody interpret these #'s?

89' Marriner[/QUOT You are trying to come out of the hole with the motor trimmed down......right? If not try that and do not start trimming up untill you are on plane
.
Looks like your SS prop is a 20 pitch and your aluminum one is a 21 pitch. They nornally go down a size in pitch when switching from aluminum to SS because the SS will not flex like the aluminum.....looks like they did this. If you are turning 5800rpm running a 20 pitch prop and having trouble planeing out you probably should go to a 19 pitch. I am assuming that your dia. is 13 inch. On my 115 yammy the reccommended top rpm range was 5000-6000. My G3 with the 115 ran 5500 with a 13X22 ss prop.....my 90 yammy is running 5500 with a 13X19 ss prop. I was advised at the boat shop to try and hit the middle of the rpm range and thats what I did. Your best bet is to go to a boat shop or prop shop where they will make a reccomendation on what to try first and if that dosen't work they will exchange props with you untill you get it right.