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I am running my 1967 Nauset with a 90-hp Yamaha 2-stroke. Currently, it is set up so the motor is 2 holes up. I am using a Yamaha Stainless Performance 3 Blade Propeller 13 1/4 x 16 MAR-GYT3B-V4-16 (310429904135) FedEx Ground or FedEx Home Delivery $450.14 on eBay. This prop works very well. However, you ought to know that with the 2-holes up configuration, I need to power tilt the motor to a rather high tilt so that there is not much spray coming from the cavitation plate. Otherwise, there is quite a bit of spray flying side-wise off of the cavitation plate.
With the motor tilted this far out, I am getting close to, but have not yet reached, the point at which water will no longer be fully available to the cooling system. With one person and a single gas tank, the boat is running at about 42 m.p.h. top speed into the wind. I've noticed that with this motor, adding some extra weight to the stern raises the bow to allow a faster speed. This is accomplished my moving fuel tanks to the rear. Eventually, I might move the console and driver seat back 4 inches or so to improve the ride. If you could get one, I think the older tower of power 100 - 125 hp Mercs would be a better choice for top speed since they are heavier.