401.2 without prop
The 90 hp Johnson outboard is not shipped with a propeller installed. The correct size is determined, and installed, when the engine is rigged on the boat.
right behind the prop, on the same shaft
$1000
Replace the shear pin.
change the prop pitch nah done that. its to do with the engine.
398lbs +prop and oil,gear lube 446lbs
Sometimes the center of the prop breaks loose and slips or the splines get stripped. Also check to make sure you have the correct pitch prop for that motor and it is fastened securely.
Mine has a 12 3/4 X 21 and does well (I believe it's my stock prop). I'm pushing a 17' Skeeter Bass Boat. Hope this helps. Scott
With 1 person in it say 180 lbs. It will go 15-20 mph. This assumes the outboard is running well and the prop in good shape.
A 4 hp Mercury outboard, produces a true 4 hp, rated at the prop.
I have a 15hp Nissan 4-stroke on a 14x32 Jon Boat and have a 13" pitch Powertech Prop and I get a max speed of 34.5mph.