I run a 2420 that had a yamaha 300hpdi on it until it was stolen over the holidays. That motor ran perfectly and with a stock 14-1/4 x 23 saltwater series prop the boat would run 58-60 mph. That was with 40 gallons of fuel, 2 full grown men, trolling motor, 4 optima batteries and our gear. Cruise was 40 mph @ 4000 rpm. I have had my boat re-powered with a 2010 suzuki df 250. I had my mechanic break in the motor since I drove it from Texas to Florida to have the work done,(he is the best mechanic), and am not picking it up until May. After the break in period was done, and he could really run the boat, he ran it 45 mph @ 4000 rpm with virtually the same load. Now I was not on the boat to verify these numbers, but he knows how to run a boat and would have no reason to exaggerate these figures. I do know that the prop is a 16 x 24.5 suzuki. This is a much larger prop in pitch and diameter, and he says the boat jumps on plane almost instantly. Suzuki outboards are larger in displacement, and have a lower gear ratio that allows them to turn a larger prop. More torque. I am picking the boat up in Pensacola and will be spending a week there fishing the first week of May. After I personally get some real numbers, I will post them with a comparison against my yamaha 300. I will also post a few picks of the GPS.
Capt. Eric D. Lucas