If you are looking at getting a Yamaha go on their web site and look at the test data they have done on boats. Maybe yours was not tested but I am sure you can find one that is pretty close to the weight and hull design of the one you are looking at(Haynie). Hard to believe that boat has a weight of 1,350# and rated for a 250hp. The test results/data that Yamaha did with the 4 stroke 150/Xpress X22Bay are pretty dang accurate compared to the way mine runs....fuel ecomony, top speed, speed @ rpms, and plane time. If anything the test data is conservative based on the load weight during the test. I usually have more weight in my boat since I fish three 90% of the time. Also, a 4 stoke can run at higher RPMS than a 2 stroke DI motor. I bet the Optimax has the same range as the HPDI...5,500 rpms compared to a 4 stoke at 6,000 RPMS. I bet that boat would fly with a 225 Optimax!
I think the 150 Yamaha 4 stoke is more than enough motor for that boat...get a jack plate.
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