This all depends on the boat in which it goes. A 25 HP outboard motor, on a 14' aluminum runabout can cruise at 20-25 mph. Now, if you were to install hydrofoils (do a Google search) to the bow and transom area of the same boat, you could go upwards of 45 MPH +. Although not very common today, hydrofoils are currently used on Italian, and American navy battleships...crazy fast
It really depends on how big your boat is and how fast you want to go typically you want to go 20-25 while tubing so get a big enough motor to push your boat with a tube 20-25 mph
25 horse power.
As fast as the wind can carry it.
25 or so I would guess. My tri cruiser with 90hp Honda goes 23.
For a 1984 Stratos bass boat model 345, a suitable outboard motor would typically range from 25 to 40 horsepower. It's important to check the boat's capacity plate, if available, for specific recommendations. Additionally, consider the boat's weight, intended use, and local regulations when selecting the motor size to ensure optimal performance and safety on the water.
The required plug gap for a 25 hp Johnson outboard is .030 in.
bout 10 to 25. depending on what size of motor
25-30 M.P.H DEPENDING ON BOAT
25-30 horse power.
Through the Dells of the Wisconsin in a Motor Boat - 1911 was released on: USA: 25 September 1911
0-60 in 20 seconds , and 25 horsepower at 9000rpm
It,s a safety guide for safe efficient use of an outboard. The other motor may be too heavy or too powerfull to control in which case you are in charge of a dangerous craft. Some people carry extra ballast to outweigh a slightly more powerfull motor, 4 strokes are heavier than 2 strokes, sea condition, number of people in the boat, other boaters, swimmers, control and safety all need to be considered. Worry about that rather than a fine.