Best combo I have ever seen was my previous rig:
Airdeck with a 2009 Yamaha 4 HP, 4-stroke.
With a 220 Lbs Norwegian Stud onboard I could do 10.9 knots.
Leaning way forward and with a tiller extension it would plane on flat water.
Any waves would slow down the magic, so would another person onboard, but still, 10,9 from 4 HP was pretty spectacular.
(Had a previous 4 HP Evinrude
2-stroke on the same dink and it would only do 7 knots plowing the water, not planning. Higher RPM
and screaming, but the 1 cylinder Yahama had much more torque. Or HP, but they were both sold as and rated at 4 HP)