Well it looks like I'm gonna be putting a deposit down on a new 4 stroke pro xs since I blew the power head on my 2009 pro xs last week. Just wondering what type of prop folks are running with this motor and a 721. I asked the owner of the dealer and he told me that the 26 pitch fury that I had on the old motor would work good on the 4 stroke but everything I've read is that people are having to drop down to a 23 or 24 pitch when they swap to the 4 stroke. By the way this will be going on a 2009 721.