Prop question for 90hp Johnson/Suzuki 4 stroke motor

[Doonbuggy]

I am looking at perhaps getting a new prop for my 90hp Johnson four stroke motor. The boat is in storage right now so I don't know the prop size, but in talking with people it's my understanding that I can increase my mph a bit while lowering my rpms if I get a prop with a bigger cup and bigger in size than the Hustler I have now.

The holeshot is great so I'd like to keep that while hopefully gaining a bit in mph.

Last fall I think I was at 5,900 rpms at wide open throttle and I should be running closer to 5,400. I hit about 36mph with this prop so I'm hoping perhaps I can hit 38-40. Most important though is that I want to be running in the proper rpm band. The mphs bump would be a bonus.

If you have a prop on this motor that works well I'd like to hear the pitch size and your thoughts. (My boat is a 17' Crestliner side-console if that matters). Thanks very much.

DB

[kjgmh]

The ecu on your computer should not let you run above 5650 rpm on that motor. So first you should double check your rpms. If still showing that need to see if tach is on proper setting, or if it is off.

I am running the same setup. I was running the 21 pitch new style Hustler in a 21 at 5400rpm and 39 mph. It had good hole shot and held well. I tried a 23 but holeshot suffered a little and rpms dropped to 5000 still at 39 mph. I picked up a stainless 21 from Hustler this winter and when we get open water I will see how that does.